Date: Fri, 30 Nov 2001 10:45:56 -0700 From: Nate Williams <nate@yogotech.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: David Malone <dwmalone@maths.tcd.ie>, Nate Williams <nate@yogotech.com>, Greg Lehey <grog@lemis.com>, developers@FreeBSD.org, FreeBSD Hackers <hackers@FreeBSD.org> Subject: Re: FreeBSD performing worse than Linux? Message-ID: <15367.50644.710575.213155@caddis.yogotech.com> In-Reply-To: <200111301030.fAUAUUS09410@apollo.backplane.com> References: <20011128153817.T61580@monorchid.lemis.com> <15364.38174.938500.946169@caddis.yogotech.com> <20011128104629.A43642@walton.maths.tcd.ie> <200111301030.fAUAUUS09410@apollo.backplane.com>
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> :> FWIW, I'm seeing this as well. However, this appears to be a new > :> occurance, as we were using a FreeBSD 3.X system for our reference test > :> platform. > : > :Someone recently submitted a PR about TCP based NFS being significantly > :slower under 4.X. I wonder if it could be related? > : > : http://www.freebsd.org/cgi/query-pr.cgi?pr=misc/32141 > : > :There is quite a lot of detail in the PR and the submitter has no > :trouble reproducing the problem. > : > : David. > > Hmm. I'll play with it a bit tomorrow. Er, later today. One thing > I noticed recently with NFS/TCP is that I have to run 'nfsiod -n 4' > on the client to get reasonable TCP performance. I don't think I > had to do that before. It sure sounds similar... like a delayed-ack > problem or improper transmit side backoff. > > It would be nice if someone able to reproduce the problem can test > the TCP connection with newreno turned off (net.inet.tcp.newreno) > and delayed acks turned off (net.inet.tcp.delayed_ack). If that > fixes the proble it narrows down our search considerably. John Capo replied that turning off both did not help his setup any. I was supposed to be testing things yesterday, but the guys got pulled away on another project. Perhaps today I'll get a chance to get some tcpdump's and some more test data. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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