global serialization points in XFS circa 2.6.27?

[Chris Friesen <chris.friesen@xxxxxxxxxxx>]

Hi,

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

--

Chris Friesen
Software Designer

3500 Carling Avenue
Ottawa, Ontario K2H 8E9
www.genband.com