On Tue, Jan 27, 2004 at 08:17:58PM +0100, Bj?rn Gr?nvall wrote: > On Sat, 24 Jan 2004 21:14:51 -0500 (EST) > Robert Watson <rwatson_at_freebsd.org> wrote: > > > 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. > > One reason that FreeBSD users experience poor NFSv3/TCP performance is > that the defaults for rsize and wsize is unusually small, only > 8k. Solaris and HP-UX defaults to 32k for a good reason. I guess TCP > simply needs a little bit more data to chew on to be efficient. > > I tested this on 5.2-CURRENT and found that large file read > performance went up from 56Mbit/s to 80Mbit/s, an improvement by 43%. > > I have written a patch that makes FreeBSD use the same defaults as > Solaris and HP-UX. Note that with NFSv3 there is no risk associated > with specifying to large values for [rw]size. The server automatically > limits these values in the fsinfo rpc. Patch is attached. If no-one picks this up in the next few days, can you please send-pr it so it does not get lost? Kris
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