On Sun, Jul 03, 2011 at 05:24:09PM -0400, Justin Piszcz wrote:

Hello,

I help to support a system (similar to mine) with a 3ware 9750-24i4e
and when you rm -rf a directory with too many files, the system will
act lagged, lock up for periods of time and drop connections
(including samba shares) to and from the host.  Its so bad it cannot
even talk to the UPS for example (ups: communications lost, e.g.
from nut).  This is pretty bad and I've remounted my XFS FS w/out
delaylog but for the xfstests package, it really needs to test with
a few million files in a directory or two, and you should easily be
able to reproduce the problem.

http://oss.sgi.com/archives/xfs/2011-06/msg00259.html

FYI, the problem is not easy to reproduce - it requires a specific
set of conditions to exist with interrupt configuration (i.e. all on
the same CPU that the log IO completions are running) to expose the
workqueue priority inversion that the filesystem level issue
triggers.

When the delaylog option is removed, the files are removed slowly,
but there are no errors, SSH/samba connections do NOT drop, etc,
please look into this, thanks.

http://oss.sgi.com/archives/xfs/2011-06/msg00463.html
http://oss.sgi.com/archives/xfs/2011-06/msg00473.html

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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