Date: Tue, 25 Jul 2006 11:09:41 -0400 (EDT) From: rick@snowhite.cis.uoguelph.ca To: fs@freebsd.org Cc: peadar.edwards@gmail.com Subject: Re: freebsd4.11 patch for nfs over tcp Message-ID: <200607251509.LAA73358@snowhite.cis.uoguelph.ca>
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> I always point people at "Rethinking the TCP Nagle Algorithm" (Mogul & > Minshall) when this comes up. It's a nice readable paper on the issues > and some propsed solutions. And, yes, it does cause performance problems for NFS. If an RPC is in the send queue, it delays sending the request. For the case I was testing that normally takes 5 seconds, it took about 3 minutes. You could watch the server's disk led "blink <wait a bit>, blink...". As an historical note, it was Tom Talpey who suggested turning off the Nagle algorithm to me in 1989, when I was observing slow NFS over TCP on a MicroVAXII (now, that means REALLY SLOOWWWW). rick
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