Date: Tue, 20 Mar 2001 10:59:21 -0800 (PST) From: Gordon Tetlow <gordont@bluemtn.net> To: Alfred Perlstein <bright@wintelcom.net> Cc: Jan Conrad <conrad@th.physik.uni-bonn.de>, <freebsd-stable@FreeBSD.ORG> Subject: Re: NFS performance Message-ID: <Pine.BSF.4.33.0103201056460.3344-100000@sdmail0.sd.bmarts.com> In-Reply-To: <20010320105404.D29888@fw.wintelcom.net>
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On Tue, 20 Mar 2001, Alfred Perlstein wrote: > Actually, from what I've been told, TCP allows for much larger requests > than what UDP does, afaik UDP maxes out at 8k while tcp should be able > to go to 32k (maybe 64k) and give possibly better performance. This is true. I'm used to working with nfs transaction sizes of < 500 bytes. > Plus each time you 'hickup' under a UDP mount it's a lot more painful > because since it's possible for each RPC to be broken into several > packets you have a lot more retransmition to do. Yup. This is why a reliable (switched) LAN is needed. > However, as the manpages and sysadmin books say, NFS tuning is a > black art and results under various setting may vary wildly. It's very application specific which is why no single formula works. Reading up on the subject is definitely required. -gordon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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