Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback - Kernel

This is a discussion on Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback - Kernel ; (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Wed, 3 Sep 2008 08:44:27 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=11490 > > Summary: Old mtrr bug comeback > Product: Memory Management > Version: 2.5 ...

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Thread: Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback

  1. Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback


    (switched to email. Please respond via emailed reply-to-all, not via the
    bugzilla web interface).

    On Wed, 3 Sep 2008 08:44:27 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote:

    > http://bugzilla.kernel.org/show_bug.cgi?id=11490
    >
    > Summary: Old mtrr bug comeback
    > Product: Memory Management
    > Version: 2.5
    > KernelVersion: v2.6.27-rc5
    > Platform: All
    > OS/Version: Linux
    > Tree: Mainline
    > Status: NEW
    > Severity: normal
    > Priority: P1
    > Component: MTTR
    > AssignedTo: akpm@osdl.org
    > ReportedBy: ak@axet.ru
    >
    >
    > Latest working kernel version:v2.6.26.3
    >
    > Old mtrr bug comeback, when i boot my notebook with last kerenl they going to
    > work really slow as turttle. to boot on normal speed i need use kernel param
    > mem=1000M
    >
    > when i use 2.6.26.3 everyting going fine. as i remember that bug fixed in
    > 2.6.26 stable release and was in 2.6.25 and earlier.
    >
    > probably you can find more details in bugzilla.redhat.com or
    > bugzilla.mozilla.com i do no remember where is exactly i have been posted that
    > old bug.
    >
    > here the point (warning on 2.6.26.3 kernel):
    >
    > WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 7MB of RAM.
    > ------------[ cut here ]------------
    > WARNING: at arch/x86/kernel/cpu/mtrr/main.c:706
    > mtrr_trim_uncached_memory+0x103/0x168()
    > Modules linked in:
    > Pid: 0, comm: swapper Not tainted 2.6.26.3 #1
    > [] ? printk+0xf/0x16
    > [] warn_on_slowpath+0x41/0x7b
    > [] ? _spin_unlock_irqrestore+0x10/0x14
    > [] ? _spin_unlock_irqrestore+0x10/0x14
    > [] ? release_console_sem+0x181/0x189
    > [] ? vprintk+0x2e6/0x30b
    > [] ? vprintk+0x2e6/0x30b
    > [] ? generic_get_mtrr+0x53/0x8a
    > [] mtrr_trim_uncached_memory+0x103/0x168
    > [] ? mtrr_bp_init+0x204/0x20c
    > [] setup_arch+0x27b/0x6ce
    > [] ? printk+0xf/0x16
    > [] start_kernel+0x64/0x2da
    > [] __init_begin+0x8/0xa
    > =======================
    > ---[ end trace 4eaa2a86a8e2da22 ]---
    > update e820 for mtrr
    > modified physical RAM map:
    >


    A post-2.6.26 regression.

    We have a couple of mtrr fixes pending:

    http://userweb.kernel.org/~akpm/mmot...-is-done.patch

    http://userweb.kernel.org/~akpm/mmot...nit_xxxx.patch

    but I don't know if they'll fix this regression?
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  2. Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback

    On Wed, Sep 3, 2008 at 9:18 AM, Andrew Morton wrote:
    >
    > (switched to email. Please respond via emailed reply-to-all, not via the
    > bugzilla web interface).
    >
    > On Wed, 3 Sep 2008 08:44:27 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote:
    >
    >> http://bugzilla.kernel.org/show_bug.cgi?id=11490
    >>
    >> Summary: Old mtrr bug comeback
    >> Product: Memory Management
    >> Version: 2.5
    >> KernelVersion: v2.6.27-rc5
    >> Platform: All
    >> OS/Version: Linux
    >> Tree: Mainline
    >> Status: NEW
    >> Severity: normal
    >> Priority: P1
    >> Component: MTTR
    >> AssignedTo: akpm@osdl.org
    >> ReportedBy: ak@axet.ru
    >>
    >>
    >> Latest working kernel version:v2.6.26.3
    >>
    >> Old mtrr bug comeback, when i boot my notebook with last kerenl they going to
    >> work really slow as turttle. to boot on normal speed i need use kernel param
    >> mem=1000M
    >>
    >> when i use 2.6.26.3 everyting going fine. as i remember that bug fixed in
    >> 2.6.26 stable release and was in 2.6.25 and earlier.
    >>
    >> probably you can find more details in bugzilla.redhat.com or
    >> bugzilla.mozilla.com i do no remember where is exactly i have been posted that
    >> old bug.
    >>
    >> here the point (warning on 2.6.26.3 kernel):
    >>
    >> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 7MB of RAM.
    >> ------------[ cut here ]------------
    >> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:706
    >> mtrr_trim_uncached_memory+0x103/0x168()
    >> Modules linked in:
    >> Pid: 0, comm: swapper Not tainted 2.6.26.3 #1
    >> [] ? printk+0xf/0x16
    >> [] warn_on_slowpath+0x41/0x7b
    >> [] ? _spin_unlock_irqrestore+0x10/0x14
    >> [] ? _spin_unlock_irqrestore+0x10/0x14
    >> [] ? release_console_sem+0x181/0x189
    >> [] ? vprintk+0x2e6/0x30b
    >> [] ? vprintk+0x2e6/0x30b
    >> [] ? generic_get_mtrr+0x53/0x8a
    >> [] mtrr_trim_uncached_memory+0x103/0x168
    >> [] ? mtrr_bp_init+0x204/0x20c
    >> [] setup_arch+0x27b/0x6ce
    >> [] ? printk+0xf/0x16
    >> [] start_kernel+0x64/0x2da
    >> [] __init_begin+0x8/0xa
    >> =======================
    >> ---[ end trace 4eaa2a86a8e2da22 ]---
    >> update e820 for mtrr
    >> modified physical RAM map:
    >>

    >
    > A post-2.6.26 regression.
    >
    > We have a couple of mtrr fixes pending:
    >
    > http://userweb.kernel.org/~akpm/mmot...-is-done.patch
    >
    > http://userweb.kernel.org/~akpm/mmot...nit_xxxx.patch
    >
    > but I don't know if they'll fix this regression?
    >


    cpu?

    dmesg with debug and initcall_debug

    cat /proc/mtrr

    YH
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  3. Re: [Bugme-new] [Bug 11490] New: Old mtrr bug comeback

    On Wed, Sep 3, 2008 at 10:08 AM, Alexey Kuznetsov wrote:
    > Can you explain what mean debug and initcall_debug?


    put "debug initcall_debug" in to grub.conf or pxe conf.

    YH
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