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    SubjectRe: pdflush eating a lot of CPU on heavy NFS I/O
    Brent Cook <busterbcook@yahoo.com> wrote:
    >
    > On Tue, 27 Apr 2004, Andrew Morton wrote:
    >
    > > Brent Cook <busterbcook@yahoo.com> wrote:
    > > >
    > > > Running any kernel from the 2.6.6-rc* series (and a few previous
    > > > -mm*'s),
    > >
    > > It's a shame this wasn't reported earlier.
    >
    > Since it was a pretty big deal on my system, I just assumed it was for
    > other people's too, and that someone else would have reported it by
    > now. I only got concerned when it persisted between rc's.

    I think three people have reported it now.

    > > > the pdflush process starts using near 100% CPU indefinitely after
    > > > a few minutes of initial NFS traffic, as far as I can tell.
    > >
    > > Please confirm that the problem is observed on the NFS client and not the
    > > NFS server? I'll assume the client.
    >
    > Yes, both affected machines had the issue when connecting as a client to a
    > 2.4.25-based NFS server.
    >
    > > What other filesystems are in use on the client?
    >
    > One uses Reiser on /, the other uses ext3 on /. Here is the mount table
    > for one machine:

    Both machines are exhibiting the problem?

    > About 10 minutes into the process, pdflush starts taking over:
    >
    > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
    > 7 root 25 0 0 0 0 RW 34.4 0.0 3:05 0 pdflush
    > 17856 busterb 25 0 69400 65M 5140 R 34.4 26.1 0:31 0 cc1plus
    > 19466 busterb 25 0 43732 39M 5140 R 26.3 15.5 0:03 0 cc1plus
    > ...
    > The network light will flash continually on each machine once pdflush
    > gets into this state, which makes me think NFS. Each machine has
    > 512-256 MB of ram and a single CPU.

    ok.. I spent a couple of hours yesterday trying to get this to happen. No
    joy. Can't make it happen with your .config either. I'll set up a 2.4.25
    server later on.

    What version of gcc are you using?

    Could you please capture the contents of /proc/meminfo and /proc/vmstats
    when it's happening?

    Thanks.
    -
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