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    SubjectRe: pdflush eating a lot of CPU on heavy NFS I/O
    On Wed, 28 Apr 2004, Andrew Morton wrote:

    > Brent Cook <busterbcook@yahoo.com> wrote:
    > >
    > > On Tue, 27 Apr 2004, Andrew Morton wrote:
    > >
    > > > Brent Cook <busterbcook@yahoo.com> wrote:
    >
    > > > > 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?

    Yes. They both exhibit about 5-10 minutes after starting once I start
    compiling from the NFS share. I'm going to also try a big compile from a
    local directory to exercise the local FS to eliminate it as a possibility.

    > > 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?

    3.3.3 previously. I just did a build with 3.4 with the same results; I'm
    tracking Slackware-current, so my build environment reflects this.

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

    Will do. I can also provide a test account to you offline if it helps so
    you can see it for yourself.

    - Brent
    -
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