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    SubjectRe: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues
    On Tue, Apr 17, 2007 at 10:14:02PM -0700, Linus Torvalds wrote:
    > On Tue, 17 Apr 2007, Florin Iucha wrote:
    > >
    > > Already did. Traces from vanilla kernel at
    > >
    > Well, there's a pdflush in io_schedule_timeout/congestion_wait, and
    > there's a nfsv4-scv in svc_recv/nfs_callback_sv, and a lot of processes
    > either just in schedule_timeout or similar "normal" waiting (pollwait
    > etc).
    > [ The call traces could be prettier, but sadly, even if you enable frame
    > pointers, the x86-64 kernel is too stupid to follow them. So you kind of
    > just have to ignore the noise) ]
    > The triggering process looks like it might be that "cp", it is in the
    > __wait_on_bit/sync_page/wait_on_page_bit/wait_on_page_writeback_range/
    > filemap_fdatawait.
    > Is this a trace from the "big copy" hang, or from a gnome splashscreen
    > hang? It *looks* like it's a big copy. Yes/no?

    It *is* big copy.

    I am monitoring the copy on the server, using "iostat 5". It writes
    for a while at a fairly constant pace (on ext3 *), then it drops to 0 in 5-10
    seconds and stays there... Once I left it for a couple of hours and
    it did not pick up.


    (*) XFS exhibited wild ups and downs in the transaction rate, and JFS
    starts strong then loses steam and slowly settles to about half ext3's

    Bruce Schneier expects the Spanish Inquisition.
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      Last update: 2007-04-18 07:29    [W:0.020 / U:19.500 seconds]
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