Date: Mon, 02 Apr 2007 08:30:32 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: freebsd-net@freebsd.org Subject: Re: em driver packet loss in 6.2 amd64 (RELEASE and STABLE) Message-ID: <46112198.2030801@u.washington.edu> In-Reply-To: <Pine.OSX.4.64.0704021013390.24760@cpe-24-90-130-108.nyc.res.rr.com> References: <Pine.OSX.4.64.0704021013390.24760@cpe-24-90-130-108.nyc.res.rr.com>
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Rob Watt wrote:
> Hi,
>
> In 6.1-RELEASE there were a number of em driver stability and
> performance issues. We would regularly see packet loss at low to
> moderate load. A number of patches were applied that completely fixed
> the problem for us.
>
> We installed 6.2-RELEASE, but even though 6.2 is supposed to have a
> stable em driver, we are noticing the same packet loss problem again.
> We updated to STABLE, and we didn't see any packet drops in our first
> day of testing, but today we are seeing packet drops again.
>
> Has anyone else experienced this? Are there known problems with the
> STABLE em driver?
>
> Our hardware:
>
> tyan s5372 motherboard (bios v1.05)
> 2 intel x5355 processors
> adaptec aic7902 scsi daughter card
> there are 4 em interfaces (2 on-board, 2 from an add-on card), but we
> are currently only using em0
>
> We have experienced the packet drop problem with a custom kernel and
> with the RELEASE SMP kernel.
>
> -
> Rob Watt
I saw a little bit of this when using vmware and a newly installed
6.2 guest machine. The problem was related to the amount of time it took
for ssh to a real 7-CURRENT box to adjust the window size (interestingly
enough). It took 15 ~ 20 additional seconds for it to adjust and later
connect.
This all occurred post authentication phase -- and I'm pretty sure
it was the last step before connecting.
-Garrett
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