Date: Sat, 24 Jan 2004 21:14:51 -0500 (EST) From: Robert Watson <rwatson@FreeBSD.ORG> To: Willem Jan Withagen <wjw@withagen.nl> Cc: current@FreeBSD.ORG Subject: Re: Old SUN NFS performance papers. Message-ID: <Pine.NEB.3.96L.1040124210942.31483E-100000@fledge.watson.org> In-Reply-To: <003c01c3de8d$d569edb0$471b3dd4@dual>
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On Mon, 19 Jan 2004, Willem Jan Withagen wrote: > I had no responses to my recent question on the difference between NFS > over UDP and TCP. So perhaps nobody cares?? > > So I tried searching but have not found much yet. Does anybody know > where to find the white papers SUN once wrote about tuning NFS??? They > should be at sun, but where?? All other suggestions to read are > welcomed as well. > > Given my last posting I'm building two machines to do some NFS benchmark > testing on. Suggestions on what people "always wanted to know (tm)" are > also welcom, and I'll see if I can get them integrated. I've found the > benchmarks in /usr/ports, some might do so nice work as well. > > If people are interested I'll keep them posted in performance@ --WjW I haven't done much benchmarking on NFS lately, but something worth remembering is that people have spent a lot of time researching and optimizing TCP for a variety of connection types, whereas the NFS code basically has a static implementation of RPC backoff and flow control that hasn't evolved much. TCP is aware of things like the pathwise-mtu to the server and adapts, whereas UDP just loses packets due to fragmentation, especially if you are using larger block sizes. Please do post your discoveries on performance@, and perhaps we could build an NFS performance tuning section in the FreeBSD Handbook (or if there's not that much content, add it to the FAQ)? Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Senior Research Scientist, McAfee Research
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