Waskiewicz Jr, Peter P wrote:
From: Rick Jones <[EMAIL PROTECTED]>
Date: Thu, 11 Oct 2007 16:50:46 -0700
For just messing about, might it be possible to tweak the socket
buffer sizes and tcp_tso_win_divisor to kludge things for a short
while? Couldn't ship that way certainly, but assuming
Peter's going
to get his broken hardware fixed it might let him limp
along until then.
TCP dynamically grows the socket buffer sizes unless the
application explicitly sets them via setsockopt() and the
limits imposed in those cases are controlled by
tcp_{,r,w}mem[] sysctls. Decreasing those will kill
performance exactly for the cases this person cares about.
I just tried turning off my explicit SO_SNDBUF/SO_RCVBUG settings in my app,
and the connection ran very poorly through a link with even a small
bit of latency (~2-4ms I believe).
It ran near gige line speed through a cross-over cable.
I have the sysctl max values set very generous, though the min
and default are fairly small.
This was with kernel 2.6.20.
Was the auto-tuning put in after 2.6.20? If not, has this
been tested through a higher latency link? Or, am I confused
and you are talking about some other setsockopt?
Thanks,
Ben
--
Ben Greear <[EMAIL PROTECTED]>
Candela Technologies Inc http://www.candelatech.com
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