Date: Fri, 30 Nov 2001 02:30:30 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: David Malone <dwmalone@maths.tcd.ie> Cc: 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: <200111301030.fAUAUUS09410@apollo.backplane.com> References: <20011128153817.T61580@monorchid.lemis.com> <15364.38174.938500.946169@caddis.yogotech.com> <20011128104629.A43642@walton.maths.tcd.ie>
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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. -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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