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    SubjectRe: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2
    From
    I did some testing with 3.0 kernel (cifs client) and was getting 90%
    wire speeds writing
    cifs files to the server (Windows or Samba)

    On Thu, Aug 18, 2011 at 11:01 AM, Steve French <smfrench@gmail.com> wrote:
    > Writing from cifs kernel client to WIndows or Samba server should be much faster
    > than the reverse (ie large file sequential file copy to server is
    > faster than copying
    > a file from the server)  cifs kernel client serializes reads from the same file
    > (unless mounting forcedirectio, in which case caching is disabled) and uses
    > a relatively smaller read size (16K) - while for writes they are sent
    > in parallel
    > even if to the same file (and the write size is much larger e.g. 126976 bytes,
    > and can be set even larger to Samba).  There may be a few cases (such
    > as copying to WIndowsXP or Windows7) where timeouts on the
    > server slow things down (writing from linux client to Windows XP
    > or Windows 7) but what is the server type?
    >
    >
    > On Thu, Aug 18, 2011 at 7:14 AM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
    >>
    >>
    >> On Thu, 18 Aug 2011, Justin Piszcz wrote:
    >>
    >>>
    >>>
    >>> On Thu, 18 Aug 2011, J. R. Okajima wrote:
    >>>
    >>>>
    >>>> Justin Piszcz:
    >>>>>
    >>>>> Does anyone know if any kernel supports CIFS w/out crashing? I'd like to
    >>>>> backup some CIFS shares, thanks.
    >>>>>
    >>>>>
    >>>>> mount -t cifs //w2/x /mnt -o user=user,pass=pass
    >>>>>
    >>>>> [  881.388836] CIFS VFS: cifs_mount failed w/return code = -22
    >>>>
    >>>>        :::
    >>>>
    >>>> Since it failed mounting, this patch will help you. Although the patch
    >>>> will fix one bug, there still may exist another problem.
    >>>>
    >>>> http://marc.info/?l=linux-cifs&m=131345112022031&w=2
    >>>
    >>> Hi,
    >>>
    >>> Latest patch (this one) applied to linux-3.1-rc2 works, at least it
    >>> mounted
    >>> this time and did not instantly crash the kernel!
    >>>
    >>> I also tried the hostname again (and it did not crash the kernel, but it
    >>> failed to mount).
    >>>
    >>> Used the IP and it mounted successfully:
    >>> //10.0.0.11/x          28T  5.0T   23T  19% /mnt
    >>> //10.0.0.11/y          19T  1.2T   18T   7% /mnt2
    >>>
    >>> It has not crashed yet (which is good), I'll apply this patch to my
    >>> production machine and test taking backups of this data and let you know
    >>> if it crashes again, thanks!
    >>>
    >>> Justin.
    >>
    >>
    >> Hello,
    >>
    >> It is working but very slowly:
    >>
    >> Device eth6 [10.0.1.2] (1/1):
    >> ================================================================================
    >> Incoming:                               Outgoing:
    >> Curr: 37.60 MByte/s                     Curr: 0.44 MByte/s
    >> Avg: 4.98 MByte/s                       Avg: 0.09 MByte/s
    >> Min: 0.00 MByte/s                       Min: 0.00 MByte/s
    >> Max: 40.79 MByte/s                      Max: 0.48 MByte/s
    >> Ttl: 1.45 GByte                         Ttl: 26.77 MByte
    >>
    >> Over 10GbE the other direction (Linux -> Windows (via Samba)) I get
    >> 500MiB/s, is CIFS slow?
    >>
    >> I'll look into options to tweak the speed but this is very poor speed when
    >> you have to transfer 5-10TB.  However, it is not crashing anymore, so any
    >> speed is better than that :)
    >>
    >> Justin.
    >>
    >>
    >
    >
    >
    > --
    > Thanks,
    >
    > Steve
    >



    --
    Thanks,

    Steve
    --
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