This is a discussion on Re: bizarre em + TSO + MSS issue in RELENG_7 - FreeBSD ; On Sat, 17 Nov 2007, Kip Macy wrote: > On Nov 17, 2007 10:33 AM, Denis Shaposhnikov wrote: >> On Sat, 17 Nov 2007 00:42:54 -0500 (EST) >> Mike Andrews wrote: >> >>> Has anyone run into problems with MSS ...
On Sat, 17 Nov 2007, Kip Macy wrote:
> On Nov 17, 2007 10:33 AM, Denis Shaposhnikov
>> On Sat, 17 Nov 2007 00:42:54 -0500 (EST)
>> Mike Andrews
>>> Has anyone run into problems with MSS not being respected when using
>>> TSO, specifically on em cards?
>> Yes, I wrote about this problem on the beginning of 2007, see
> * Payload size per packet w/o any headers.
> * Length of all headers up to payload.
> TXD->tcp_seg_setup.fields.mss = htole16(mp->m_pkthdr.tso_segsz);
> TXD->tcp_seg_setup.fields.hdr_len = hdr_len;
> Please print out the value of tso_segsz here. It appears to be being
> set correctly. The only thing I can think of is that t_maxopd is not
> correct. As tso_segsz is correct here:
It repeatedly prints 1368 during a 1 meg file transfer over a connection
with a 1380 MSS. Any other printf's I can add? I'm working on a web page
with tcpdump / firewall log output illustrating the issue...
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