Re: Old SUN NFS performance papers.

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 01/27/04

  • Next message: Björn Grönvall: "Re: Old SUN NFS performance papers." 
    Date: Tue, 27 Jan 2004 13:04:45 -0800
To: Bj?rn Gr?nvall <bg@sics.se>

    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@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

  • Next message: Björn Grönvall: "Re: Old SUN NFS performance papers."