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    SubjectRe: nfs slowdown since 2.5.4
    On Tuesday 04 June 2002 14:23, Trond Myklebust wrote:
    > >>>>> " " == Matthias Welk <> writes:
    > > Hi, since 2.5.4 I noticed a big slowdown in nfs. It seems that
    > > this is related to the changes in the nfs-lookup code, because
    > > now most traffic via nfs is for lookup- and getattr-calls as
    > > you can see in the attached tcpdump log. I'v also attached a
    > > log of nfsstat, which shows this problem too.
    > Tough... Those extra checks are needed in order to ensure data cache
    > correctness on file open().
    > If you think you don't need them because the files that you are
    > reading are known never to change on the server, you can try mounting
    > with the 'nocto' mount option.

    I tried again with the 'nocto' mount option, although I can't be sure that the
    files will not change on the server, but the behaviour didn't change :-(

    To get more info about this problem I compared the compile time and the nfs
    traffic between 2.4.18-4 and 2.5.20 on a RedHat 7.3 system.
    The sources (mosfet-liquid0.9.5.tar.gz - KDE style) were located on the local
    disc and the libraries were linked over nfs.
    The results attached to this mail show the big difference !

    I hope you can do anything with it.

    Greetings, Matthias.
    From: Matthias Welk office: +49-30-3463-7272
    FHG Fokus mobile: +49-179- 1144752
    Kaiserin-Augusta-Allee 31 fax : +49-30-3463-8672
    10589 Berlin email :

    #time to build on a RedHat 7.3 system with 2.4.18-4

    real 1m1.301s
    user 0m50.920s
    sys 0m8.390s

    lookup: 2820
    getattr: 22
    readdir: 96
    frag: 66#time to build on a RedHat 7.3 system with 2.5.20

    real 1m48.509s
    user 0m51.320s
    sys 0m12.790s

    lookup: 287582
    getattr: 2546
    readdir: 1958
    frag: 8465
     \ /
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