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global serialization points in XFS circa 2.6.27?

To: Ben Myers <bpm@xxxxxxx>, Alex Elder <elder@xxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: global serialization points in XFS circa 2.6.27?
From: Chris Friesen <chris.friesen@xxxxxxxxxxx>
Date: Thu, 13 Sep 2012 17:23:33 -0600
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I've got an embedded system running a modified 2.6.27 (yes, we're trying to upgrade) and we're running into a scenario where something is happening that causes accesses to *all* XFS filesystems to hang or be delayed for some time.

I know it may be a bit of a stretch since the kernel is old, but I was wondering if you might have any suggestions as to what I might look at as far as locks/algorithms within XFS that would affect all filesystems.

In case it matters, the hardware is fairly beefy-- 32 threads of Sandy Bridge CPU, 64GB RAM, SAS drives, etc.



Chris Friesen
Software Designer

3500 Carling Avenue
Ottawa, Ontario K2H 8E9

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