[Samba] performance problem with 3.2.8: unbuffered reads for some users

Volker Lendecke Volker.Lendecke at SerNet.DE
Wed Mar 4 15:16:44 GMT 2009

On Wed, Mar 04, 2009 at 03:58:20PM +0100, Alexander 'Leo' Bergolth wrote:
> Here's the log for the unbuffered session:
>   http://leo.kloburg.at/tmp/samba/log.gf2.gz

That's the key:

[2009/03/04 15:51:48,  3] smbd/oplock_linux.c:linux_set_kernel_oplock(138)
  linux_set_kernel_oplock: Refused oplock on file Firefox/LICENSE, fd = 28, file_id = fd03:157b181.  (Permission denied)

Do you have something like SELinux or so? Or do you share
the files via NFS and some NFS client has the files open? To
work around this problem, you might want to try setting

kernel oplocks = no

in the global section of your smb.conf file.

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