Old SUN NFS performance papers.

Kris Kennaway kris at obsecurity.org
Tue Jan 27 13:07:07 PST 2004

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?

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