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    SubjectRe: NFS read performance ugliness
    Hi,

    Zlatko Calusic:
    >
    > I'm attaching two tcpdump logs (one from Solaris and one from
    > Linux). On both logs, machine names are shortened to local (always
    > Linux - client) and remote (always Solaris - server). Logs are taken
    > while I was doing cp /dev/zero, on Linux side (copying to NFS mounted
    > directory, of course).
    >
    > 1/2) tcpdump log on Solaris (server) side:
    > [...]
    > 2/2) tcpdump log on Linux (client) side
    >
    > 11:37:23.484132 local > remote: (frag 1251:1308@2960)
    > 11:37:23.484227 local > remote: (frag 1251:1480@1480+)
    > 11:37:23.484343 local.4047701504 > remote.nfs: 1472 write [|nfs] (frag 1251:1480@0+)
    > 11:37:23.542237 remote.nfs > local.4047701504: reply ok 96 write [|nfs] (DF)

    That looks like the Solaris box takes its time writing the data to disk
    (i.e., no networking problems).

    I don't have any idea why it would do that. 50 msec for a simple 4096-byte
    write?? Give me a break...

    --
    Matthias Urlichs | noris network GmbH | smurf@noris.de | ICQ: 20193661
    The quote was selected randomly. Really. | http://www.noris.de/~smurf/
    --
    You have several detached dead trees.

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