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    SubjectRe: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2
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    On Thu, Aug 18, 2011 at 12:16 PM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
    >
    >
    > On Thu, 18 Aug 2011, Jeff Layton wrote:
    >
    >> On Thu, 18 Aug 2011 09:15:36 -0400 (EDT)
    >> Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
    >>
    >>>
    >>>
    >>> On Thu, 18 Aug 2011, Jeff Layton wrote:
    >>>
    >>>> On Thu, 18 Aug 2011 08:22:44 -0400 (EDT)
    >>>> Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
    >>>>
    >>>>> Justin.
    >>>>>
    >>>>
    >>>> To be clear -- incoming in this case is reads or writes?
    >>>
    >>> Reading from the CIFS share (Windows 7).
    >>>
    >>>>
    >>>> Up until 3.0 cifs.ko didn't parallelize writes from a single thread. In
    >>>> 3.0 I added a patchset to increase the allowable wsize and to allow the
    >>>> kernel to issue writes in parallel.
    >>>
    >>> Ahh, good to know, have not tried writes yet.
    >>>
    >>>>
    >>>> Reads still suffer from the same problem however. I'm working on a
    >>>> patchset that should do the same thing for them, but it requires a
    >>>> fairly substantial overhaul of the receive codepaths.
    >>>
    >>> Ok, that explains it then, thanks.
    >
    >
    > Hi,
    >
    > Watching the rsync, it ran for a while, then:
    >
    > rsync: send_files failed to open "/cifs/w1/r1/data/hs12/f4_0.JPG": Cannot
    > allocate memory (12)
    > rsync: send_files failed to open "/cifs/w1/r1/data/hs12/f4_1.JPG": Cannot
    > allocate memory (12)
    > rsync: send_files failed to open "/cifs/w1/r1/data/hs12/f4_2.JPG": Cannot
    > allocate memory (12)
    > rsync: send_files failed to open "/cifs/w1/r1/data/hs12/f4_0.JPG": Cannot
    > allocate memory (12)

    When we were testing async write to Windows 7 Pavel mentioned to me
    another WIndows 7 bug - which may be what you are hitting.

    Under stress of simultaneous operations, Windows 7 server will sometimes start
    responding with STATUS_INSUFF_SERVER_RESOURCES error code
    (mapped to posix error ENOMEM by the Linux cifs kernel client)
    He solved it by setting MaxWorkItems to 4096 in the Windows 7 registry.

    If anyone knows whether Microsoft has fixed this or has a bug #, let us know
    because it is easier to hit with Linux kernel 3.0 and later (to
    Windows 7 server).



    --
    Thanks,

    Steve


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