Christoph, On Wed, Aug 04, 2010 at 04:50:39AM -0400, Christoph Hellwig wrote: > On Wed, Aug 04, 2010 at 09:35:46AM +0200, Dominik Brodowski wrote: > > How can I best track down the cause of the performance problem, > > a) without rebooting too often, and > > b) without breaking up the setup specified above (production system)? > > So did you just upgrade the system from an earlier kernel that did not > show these problems? No, 2.6.31 to 2.6.34 show similar behaviour. > Or did no one notice them before? Well, there are some reports relating to XFS on MD or RAID, though I couldn't find a resolution to the issues reported, e.g. - http://kerneltrap.org/mailarchive/linux-raid/2009/10/12/6490333 - http://lkml.indiana.edu/hypermail/linux/kernel/1006.1/00099.html However, I think we can rule out barriers, as XFS is mounted "nobarrier" here. Best, Dominik -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
