Very slow network - Ubuntu - Networking

This is a discussion on Very slow network - Ubuntu - Networking ; I have searched ubuntu forums to no avail. My network connection has slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%. My machine AMDSMP is dual ...

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Thread: Very slow network - Ubuntu

  1. Very slow network - Ubuntu

    I have searched ubuntu forums to no avail. My network connection has
    slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.

    My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    RAM), network is at full speed with win2k and Fedora Core 5 (now
    deleted) on this machine.

    I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    this problem with the network slowdowns.

    My benchmark is http://www.testmy.net/ website. Every machine on the
    network has been tested separately, while other machines were turned off.

    Didn't matter whether the connection was static or dhcp.
    I have also noticed slowdowns (high latency) while playing on-line games
    like bzflag
    My /etc/network/interfaces :
    auto lo
    iface lo inet loopback
    auto eth0
    iface eth0 inet static
    address 192.168.1.2
    netmask 255.255.255.0
    gateway 192.168.1.1

    ifconfig output:

    eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)

    What went wrong?

  2. Re: Very slow network - Ubuntu

    Just as a quick thought, have you tried swapping network cables and if
    you have, have you tried plugging it into a different port on your router?



    A. Ben Hmeda wrote:
    > I have searched ubuntu forums to no avail. My network connection has
    > slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    > have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >
    > My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    > RAM), network is at full speed with win2k and Fedora Core 5 (now
    > deleted) on this machine.
    >
    > I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    > Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    > this problem with the network slowdowns.
    >
    > My benchmark is http://www.testmy.net/ website. Every machine on the
    > network has been tested separately, while other machines were turned off.
    >
    > Didn't matter whether the connection was static or dhcp.
    > I have also noticed slowdowns (high latency) while playing on-line games
    > like bzflag
    > My /etc/network/interfaces :
    > auto lo
    > iface lo inet loopback
    > auto eth0
    > iface eth0 inet static
    > address 192.168.1.2
    > netmask 255.255.255.0
    > gateway 192.168.1.1
    >
    > ifconfig output:
    >
    > eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    > inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    > RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    > TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:1000
    > RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >
    > lo Link encap:Local Loopback
    > inet addr:127.0.0.1 Mask:255.0.0.0
    > UP LOOPBACK RUNNING MTU:16436 Metric:1
    > RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    > TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:0
    > RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >
    > What went wrong?


  3. Re: Very slow network - Ubuntu

    On Sat, 17 Mar 2007 15:34:47 -0400, A. Ben Hmeda wrote:

    > I have searched ubuntu forums to no avail. My network connection has
    > slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    > have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >
    > My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    > RAM), network is at full speed with win2k and Fedora Core 5 (now
    > deleted) on this machine.
    >
    > I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    > Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    > this problem with the network slowdowns.
    >
    > My benchmark is http://www.testmy.net/ website. Every machine on the
    > network has been tested separately, while other machines were turned off.
    >
    > Didn't matter whether the connection was static or dhcp.
    > I have also noticed slowdowns (high latency) while playing on-line games
    > like bzflag
    > My /etc/network/interfaces :
    > auto lo
    > iface lo inet loopback
    > auto eth0
    > iface eth0 inet static
    > address 192.168.1.2
    > netmask 255.255.255.0
    > gateway 192.168.1.1
    >
    > ifconfig output:
    >
    > eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    > inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    > RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    > TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:1000
    > RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >
    > lo Link encap:Local Loopback
    > inet addr:127.0.0.1 Mask:255.0.0.0
    > UP LOOPBACK RUNNING MTU:16436 Metric:1
    > RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    > TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:0
    > RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >
    > What went wrong?


    You have a dual CPU machine. Have you checked to see if Ubuntu installed
    an SMP kernel? Have you updated/upgraded your system, since the initial
    install? What percentage is your CPU usage? man top for the details. If
    it's more than a few percent or it's close to 100%, then I'd say you've
    got a runaway process that's hogging the CPU and slowing everything down.

    Have you checked your Ubuntu iso and CD burn for different checksums? You
    may have a bad download or a bad burn or both. If you downloaded Ubuntu
    on a Windows machine using IE, then you probably have a corrupted iso.
    Use a dedicated ftp client, if you must download on a Windows machine. IE
    does screwy things to Linux iso's when you use it to download.

    If all of the above checks out as good. Just wipe the entire Ubuntu
    install, do a badblocks check on the partitions, and reinstall it. Could
    be a bad install. It happens.

    Stef

  4. Re: Very slow network - Ubuntu

    CM wrote:
    > Just as a quick thought, have you tried swapping network cables and if
    > you have, have you tried plugging it into a different port on your router?
    >
    >
    >
    > A. Ben Hmeda wrote:
    >> I have searched ubuntu forums to no avail. My network connection has
    >> slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    >> have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >>
    >> My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    >> RAM), network is at full speed with win2k and Fedora Core 5 (now
    >> deleted) on this machine.
    >>
    >> I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    >> Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    >> this problem with the network slowdowns.
    >>
    >> My benchmark is http://www.testmy.net/ website. Every machine on the
    >> network has been tested separately, while other machines were turned off.
    >>
    >> Didn't matter whether the connection was static or dhcp.
    >> I have also noticed slowdowns (high latency) while playing on-line games
    >> like bzflag
    >> My /etc/network/interfaces :
    >> auto lo
    >> iface lo inet loopback
    >> auto eth0
    >> iface eth0 inet static
    >> address 192.168.1.2
    >> netmask 255.255.255.0
    >> gateway 192.168.1.1
    >>
    >> ifconfig output:
    >>
    >> eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    >> inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    >> RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    >> TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    >> collisions:0 txqueuelen:1000
    >> RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >>
    >> lo Link encap:Local Loopback
    >> inet addr:127.0.0.1 Mask:255.0.0.0
    >> UP LOOPBACK RUNNING MTU:16436 Metric:1
    >> RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    >> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    >> collisions:0 txqueuelen:0
    >> RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >>
    >> What went wrong?


    No I have not. As I mentioned, network is as fast as it can be under
    win2k and Fedora5 (on the same machine) it is just when I boot into
    Ubuntu, it slows right down.

    As I was trying to figure this out, I noticed that network speed is
    drastically improved under Ubuntu when I open the
    System>>Administration>>Networking and just click OK, without actually
    changing anything! This makes no sense to me and I have no explanation
    for it, it certainly does not change the content in my
    /etc/network/interfaces but I was able to duplicate the steps with same
    results every time.

  5. Re: Very slow network - Ubuntu

    Stefan Patric wrote:
    > On Sat, 17 Mar 2007 15:34:47 -0400, A. Ben Hmeda wrote:
    >
    >> I have searched ubuntu forums to no avail. My network connection has
    >> slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    >> have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >>
    >> My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    >> RAM), network is at full speed with win2k and Fedora Core 5 (now
    >> deleted) on this machine.
    >>
    >> I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    >> Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    >> this problem with the network slowdowns.
    >>
    >> My benchmark is http://www.testmy.net/ website. Every machine on the
    >> network has been tested separately, while other machines were turned off.
    >>
    >> Didn't matter whether the connection was static or dhcp.
    >> I have also noticed slowdowns (high latency) while playing on-line games
    >> like bzflag
    >> My /etc/network/interfaces :
    >> auto lo
    >> iface lo inet loopback
    >> auto eth0
    >> iface eth0 inet static
    >> address 192.168.1.2
    >> netmask 255.255.255.0
    >> gateway 192.168.1.1
    >>
    >> ifconfig output:
    >>
    >> eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    >> inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    >> RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    >> TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    >> collisions:0 txqueuelen:1000
    >> RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >>
    >> lo Link encap:Local Loopback
    >> inet addr:127.0.0.1 Mask:255.0.0.0
    >> UP LOOPBACK RUNNING MTU:16436 Metric:1
    >> RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    >> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    >> collisions:0 txqueuelen:0
    >> RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >>
    >> What went wrong?

    >
    > You have a dual CPU machine. Have you checked to see if Ubuntu installed
    > an SMP kernel? Have you updated/upgraded your system, since the initial
    > install? What percentage is your CPU usage? man top for the details. If
    > it's more than a few percent or it's close to 100%, then I'd say you've
    > got a runaway process that's hogging the CPU and slowing everything down.
    >
    > Have you checked your Ubuntu iso and CD burn for different checksums? You
    > may have a bad download or a bad burn or both. If you downloaded Ubuntu
    > on a Windows machine using IE, then you probably have a corrupted iso.
    > Use a dedicated ftp client, if you must download on a Windows machine. IE
    > does screwy things to Linux iso's when you use it to download.
    >
    > If all of the above checks out as good. Just wipe the entire Ubuntu
    > install, do a badblocks check on the partitions, and reinstall it. Could
    > be a bad install. It happens.
    >
    > Stef


    Answering your questions:
    I fetched the smp kernel from the ubuntu archives myself
    The system is fully patched to dapper-security
    no runaway processes
    I received the CDs by mail from ubuntu.com
    As for the screwy stuff, please see my reply to CM
    Thanks

  6. Re: Very slow network - Ubuntu

    On Sat, 17 Mar 2007 19:21:10 -0400, A. Ben Hmeda wrote:

    > Stefan Patric wrote:
    >> On Sat, 17 Mar 2007 15:34:47 -0400, A. Ben Hmeda wrote:
    >>
    >>> I have searched ubuntu forums to no avail. My network connection has
    >>> slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    >>> have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >>>
    >>> My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    >>> RAM), network is at full speed with win2k and Fedora Core 5 (now
    >>> deleted) on this machine.
    >>>
    >>> I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    >>> Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    >>> this problem with the network slowdowns.
    >>>
    >>> My benchmark is http://www.testmy.net/ website. Every machine on the
    >>> network has been tested separately, while other machines were turned off.
    >>>
    >>> Didn't matter whether the connection was static or dhcp.
    >>> I have also noticed slowdowns (high latency) while playing on-line games
    >>> like bzflag
    >>> My /etc/network/interfaces :
    >>> auto lo
    >>> iface lo inet loopback
    >>> auto eth0
    >>> iface eth0 inet static
    >>> address 192.168.1.2
    >>> netmask 255.255.255.0
    >>> gateway 192.168.1.1
    >>>
    >>> ifconfig output:
    >>>
    >>> eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    >>> inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    >>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    >>> RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    >>> TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    >>> collisions:0 txqueuelen:1000
    >>> RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >>>
    >>> lo Link encap:Local Loopback
    >>> inet addr:127.0.0.1 Mask:255.0.0.0
    >>> UP LOOPBACK RUNNING MTU:16436 Metric:1
    >>> RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    >>> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    >>> collisions:0 txqueuelen:0
    >>> RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >>>
    >>> What went wrong?

    >>
    >> You have a dual CPU machine. Have you checked to see if Ubuntu installed
    >> an SMP kernel? Have you updated/upgraded your system, since the initial
    >> install? What percentage is your CPU usage? man top for the details. If
    >> it's more than a few percent or it's close to 100%, then I'd say you've
    >> got a runaway process that's hogging the CPU and slowing everything down.
    >>
    >> Have you checked your Ubuntu iso and CD burn for different checksums? You
    >> may have a bad download or a bad burn or both. If you downloaded Ubuntu
    >> on a Windows machine using IE, then you probably have a corrupted iso.
    >> Use a dedicated ftp client, if you must download on a Windows machine. IE
    >> does screwy things to Linux iso's when you use it to download.
    >>
    >> If all of the above checks out as good. Just wipe the entire Ubuntu
    >> install, do a badblocks check on the partitions, and reinstall it. Could
    >> be a bad install. It happens.
    >>
    >> Stef

    >
    > Answering your questions:
    > I fetched the smp kernel from the ubuntu archives myself
    > The system is fully patched to dapper-security
    > no runaway processes
    > I received the CDs by mail from ubuntu.com
    > As for the screwy stuff, please see my reply to CM
    > Thanks


    I read your reply to CM (quoted below). Yes, that is strange, but not
    unheard of. (I had a similar thing some years ago with Slackware and
    CUPS. Printing wouldn't work until you open CUPS' html config
    interface,selected administer printers, select the printer -- there was
    only one -- and save without changing anything, then printing worked
    until you rebooted. Then you had to do it all over, again. All the
    config files were correctly set up.

    Anyway, with your system, this suggests to me that something IS wrong
    with your install. Or you could have a bad CD. Or something was changed
    when you update/upgraded and/or installed the SMP kernel. Try installing
    Ubuntu from the purchased CD on a new partition without erasing the old
    install. Go through the whole upgrade thing and see if you have the same
    problem.

    Personally, I'd download 6.10 and burn my own CD, then I'd know at least
    that was without errors.

    Good luck....

    Stef

    ================================================== ==================
    Reply to CM [snipped]

    As I was trying to figure this out, I noticed that network speed is
    drastically improved under Ubuntu when I open the
    System>>Administration>>Networking and just click OK, without actually
    changing anything! This makes no sense to me and I have no explanation
    for it, it certainly does not change the content in my
    /etc/network/interfaces but I was able to duplicate the steps with same
    results every time.

    ================================================== ===================

  7. Re: Very slow network - Ubuntu

    Stefan Patric wrote:
    > On Sat, 17 Mar 2007 19:21:10 -0400, A. Ben Hmeda wrote:
    >
    >> Stefan Patric wrote:
    >>> On Sat, 17 Mar 2007 15:34:47 -0400, A. Ben Hmeda wrote:
    >>>
    >>>> I have searched ubuntu forums to no avail. My network connection has
    >>>> slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    >>>> have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >>>>
    >>>> My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    >>>> RAM), network is at full speed with win2k and Fedora Core 5 (now
    >>>> deleted) on this machine.
    >>>>
    >>>> I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    >>>> Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    >>>> this problem with the network slowdowns.
    >>>>
    >>>> My benchmark is http://www.testmy.net/ website. Every machine on the
    >>>> network has been tested separately, while other machines were turned off.
    >>>>
    >>>> Didn't matter whether the connection was static or dhcp.
    >>>> I have also noticed slowdowns (high latency) while playing on-line games
    >>>> like bzflag
    >>>> My /etc/network/interfaces :
    >>>> auto lo
    >>>> iface lo inet loopback
    >>>> auto eth0
    >>>> iface eth0 inet static
    >>>> address 192.168.1.2
    >>>> netmask 255.255.255.0
    >>>> gateway 192.168.1.1
    >>>>
    >>>> ifconfig output:
    >>>>
    >>>> eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    >>>> inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    >>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    >>>> RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    >>>> TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    >>>> collisions:0 txqueuelen:1000
    >>>> RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >>>>
    >>>> lo Link encap:Local Loopback
    >>>> inet addr:127.0.0.1 Mask:255.0.0.0
    >>>> UP LOOPBACK RUNNING MTU:16436 Metric:1
    >>>> RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    >>>> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    >>>> collisions:0 txqueuelen:0
    >>>> RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >>>>
    >>>> What went wrong?
    >>> You have a dual CPU machine. Have you checked to see if Ubuntu installed
    >>> an SMP kernel? Have you updated/upgraded your system, since the initial
    >>> install? What percentage is your CPU usage? man top for the details. If
    >>> it's more than a few percent or it's close to 100%, then I'd say you've
    >>> got a runaway process that's hogging the CPU and slowing everything down.
    >>>
    >>> Have you checked your Ubuntu iso and CD burn for different checksums? You
    >>> may have a bad download or a bad burn or both. If you downloaded Ubuntu
    >>> on a Windows machine using IE, then you probably have a corrupted iso.
    >>> Use a dedicated ftp client, if you must download on a Windows machine. IE
    >>> does screwy things to Linux iso's when you use it to download.
    >>>
    >>> If all of the above checks out as good. Just wipe the entire Ubuntu
    >>> install, do a badblocks check on the partitions, and reinstall it. Could
    >>> be a bad install. It happens.
    >>>
    >>> Stef

    >> Answering your questions:
    >> I fetched the smp kernel from the ubuntu archives myself
    >> The system is fully patched to dapper-security
    >> no runaway processes
    >> I received the CDs by mail from ubuntu.com
    >> As for the screwy stuff, please see my reply to CM
    >> Thanks

    >
    > I read your reply to CM (quoted below). Yes, that is strange, but not
    > unheard of. (I had a similar thing some years ago with Slackware and
    > CUPS. Printing wouldn't work until you open CUPS' html config
    > interface,selected administer printers, select the printer -- there was
    > only one -- and save without changing anything, then printing worked
    > until you rebooted. Then you had to do it all over, again. All the
    > config files were correctly set up.
    >
    > Anyway, with your system, this suggests to me that something IS wrong
    > with your install. Or you could have a bad CD. Or something was changed
    > when you update/upgraded and/or installed the SMP kernel. Try installing
    > Ubuntu from the purchased CD on a new partition without erasing the old
    > install. Go through the whole upgrade thing and see if you have the same
    > problem.
    >
    > Personally, I'd download 6.10 and burn my own CD, then I'd know at least
    > that was without errors.
    >
    > Good luck....
    >
    > Stef
    >
    > ================================================== ==================
    > Reply to CM [snipped]
    >
    > As I was trying to figure this out, I noticed that network speed is
    > drastically improved under Ubuntu when I open the
    > System>>Administration>>Networking and just click OK, without actually
    > changing anything! This makes no sense to me and I have no explanation
    > for it, it certainly does not change the content in my
    > /etc/network/interfaces but I was able to duplicate the steps with same
    > results every time.
    >
    > ================================================== ===================


    I might just do that. Thank you all.

  8. Re: Very slow network - Ubuntu

    A partial list of things to check, not necessarily in any order:

    *) packet losses - check that netstat and ethtool stats are "clean"

    *) TCP window sizes

    *) firewall settings

    *) whether or not net.ipv4.tcp_abc is set (if you have apps making
    lots of small sends)

    rick jones
    --
    firebug n, the idiot who tosses a lit cigarette out his car window
    these opinions are mine, all mine; HP might not want them anyway...
    feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

  9. Re: Very slow network - Ubuntu

    Stefan Patric wrote:
    > On Sat, 17 Mar 2007 19:21:10 -0400, A. Ben Hmeda wrote:
    >
    >> Stefan Patric wrote:
    >>> On Sat, 17 Mar 2007 15:34:47 -0400, A. Ben Hmeda wrote:
    >>>
    >>>> I have searched ubuntu forums to no avail. My network connection has
    >>>> slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
    >>>> have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
    >>>>
    >>>> My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
    >>>> RAM), network is at full speed with win2k and Fedora Core 5 (now
    >>>> deleted) on this machine.
    >>>>
    >>>> I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
    >>>> Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
    >>>> this problem with the network slowdowns.
    >>>>
    >>>> My benchmark is http://www.testmy.net/ website. Every machine on the
    >>>> network has been tested separately, while other machines were turned off.
    >>>>
    >>>> Didn't matter whether the connection was static or dhcp.
    >>>> I have also noticed slowdowns (high latency) while playing on-line games
    >>>> like bzflag
    >>>> My /etc/network/interfaces :
    >>>> auto lo
    >>>> iface lo inet loopback
    >>>> auto eth0
    >>>> iface eth0 inet static
    >>>> address 192.168.1.2
    >>>> netmask 255.255.255.0
    >>>> gateway 192.168.1.1
    >>>>
    >>>> ifconfig output:
    >>>>
    >>>> eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
    >>>> inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    >>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    >>>> RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
    >>>> TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
    >>>> collisions:0 txqueuelen:1000
    >>>> RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
    >>>>
    >>>> lo Link encap:Local Loopback
    >>>> inet addr:127.0.0.1 Mask:255.0.0.0
    >>>> UP LOOPBACK RUNNING MTU:16436 Metric:1
    >>>> RX packets:9 errors:0 dropped:0 overruns:0 frame:0
    >>>> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
    >>>> collisions:0 txqueuelen:0
    >>>> RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
    >>>>
    >>>> What went wrong?
    >>> You have a dual CPU machine. Have you checked to see if Ubuntu installed
    >>> an SMP kernel? Have you updated/upgraded your system, since the initial
    >>> install? What percentage is your CPU usage? man top for the details. If
    >>> it's more than a few percent or it's close to 100%, then I'd say you've
    >>> got a runaway process that's hogging the CPU and slowing everything down.
    >>>
    >>> Have you checked your Ubuntu iso and CD burn for different checksums? You
    >>> may have a bad download or a bad burn or both. If you downloaded Ubuntu
    >>> on a Windows machine using IE, then you probably have a corrupted iso.
    >>> Use a dedicated ftp client, if you must download on a Windows machine. IE
    >>> does screwy things to Linux iso's when you use it to download.
    >>>
    >>> If all of the above checks out as good. Just wipe the entire Ubuntu
    >>> install, do a badblocks check on the partitions, and reinstall it. Could
    >>> be a bad install. It happens.
    >>>
    >>> Stef

    >> Answering your questions:
    >> I fetched the smp kernel from the ubuntu archives myself
    >> The system is fully patched to dapper-security
    >> no runaway processes
    >> I received the CDs by mail from ubuntu.com
    >> As for the screwy stuff, please see my reply to CM
    >> Thanks

    >
    > I read your reply to CM (quoted below). Yes, that is strange, but not
    > unheard of. (I had a similar thing some years ago with Slackware and
    > CUPS. Printing wouldn't work until you open CUPS' html config
    > interface,selected administer printers, select the printer -- there was
    > only one -- and save without changing anything, then printing worked
    > until you rebooted. Then you had to do it all over, again. All the
    > config files were correctly set up.
    >
    > Anyway, with your system, this suggests to me that something IS wrong
    > with your install. Or you could have a bad CD. Or something was changed
    > when you update/upgraded and/or installed the SMP kernel. Try installing
    > Ubuntu from the purchased CD on a new partition without erasing the old
    > install. Go through the whole upgrade thing and see if you have the same
    > problem.
    >
    > Personally, I'd download 6.10 and burn my own CD, then I'd know at least
    > that was without errors.
    >
    > Good luck....
    >
    > Stef
    >
    > ================================================== ==================
    > Reply to CM [snipped]
    >
    > As I was trying to figure this out, I noticed that network speed is
    > drastically improved under Ubuntu when I open the
    > System>>Administration>>Networking and just click OK, without actually
    > changing anything! This makes no sense to me and I have no explanation
    > for it, it certainly does not change the content in my
    > /etc/network/interfaces but I was able to duplicate the steps with same
    > results every time.
    >
    > ================================================== ===================


    FWIW, I have clean-installed Edgy (Ubuntu 6.10) and found that the
    problem is still there. I still had to issue /etc/init.d/networking
    restart after my system has booted otherwise my network connection
    crawls at 15kB to 45kB (max) vs. 90kB to 120 kB. I'm back to 6.06.1 LTS
    because Canonical is issuing security updates for it until 2009 (2011
    for servers).

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