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    SubjectRe: Process hangs on blk_congestion_wait copying large file to cifs filesystem
    On Fri, May 28 2004, Nuno Ferreira wrote:
    > On Qui, 2004-05-27 at 16:45 +0100, Nuno Ferreira wrote:
    > > Hi,
    > > I'm trying to copy a large file (200Mb or bigger) from an ext3
    > > filesystem to a windows share mounted using CIFS and the cp process
    > > hangs, sometimes for a long time (several minutes).
    > > Calling ps, I can see that it's blocking on blk_congestion_wait.
    > >
    > > Trying to edit a file on the same ext3 filesystem using vi blocks on the
    > > same function. However, during that that same time that vi and cp were
    > > blocked, I was able to do a "find /usr/share/doc" and it completed
    > > normally, in a few seconds.
    > >
    > > Eventually the copy succeeds but it takes a long time (20 minutes to
    > > copy 200Mb) and the computer is unusable during most of that time.
    > >
    > > This is copying from my laptop (IDE disk), the network card is a RTL8139
    > > using 8139cp drivers.
    > >
    > > Is someone seeing a similiar problem? What extra info is needed to debug
    > > it?
    >
    > Mmm, anyone with a similar problem? What should I do, make a profile
    > like explained in Documentation/basic_profiling.txt or is the above
    > information about the function where the processes are "stuck" enough?
    > One thing I forgot to mention, during the several minutes the processes
    > are stuck on that function there is no disk activity, so it's not the
    > processes being starved. In fact, there is no other activity on the
    > machine apart from the copy.

    A sysrq-t back trace of that process would be interesting to see.

    --
    Jens Axboe

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