Date: Sun, 11 Nov 2001 13:34:33 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Nate Williams <nate@yogotech.com> Cc: stable@FreeBSD.ORG, jayanth@FreeBSD.ORG Subject: Re: TCP NewReno causing wild performance fluctuations Message-ID: <200111112134.fABLYXK47890@apollo.backplane.com> References: <15340.20191.441648.662113@caddis.yogotech.com>
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I think you should MFC this, Nate.
-Matt
Matthew Dillon
<dillon@backplane.com>
:We've been using FreeBSD boxes as our reference ftp servers at work, and
:because of the recent security issues, I've went through and updated a
:number of our public boxes from 3.x -> 4.4.
:
:However, we're seeing significant variations in ftp throughput from
:boxes that are directly connected on the lan segment. If I disable the
:New Reno code, things go back to normal (ie; no fluctuations).
:
:I went through the logfiles, and it turns out there has been one fix to
:the code that hasn't been merged into stable.
:
:Rev1.139 in tcp_input.c has not (yet) been merged into -stable.
:...
:
:I hand-merged this change back onto my box, installed a new kernel, and
:now in my *very* minor testing things appear to be more normal. My
:question is should this fix be merged into stable, and would the lack of
:this bugfix explain my performance results?
:
:Unfortunately, I don't haven't gotten any tcpdump outputs to analyze
:what was going on, but I didn't want this bugfix to slip through the
:cracks.
:
:Nate
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