On Thu, Nov 22, 2012 at 06:13:48PM -0800, Keith Keller wrote: > Hello all, > > I recently deployed a new CentOS 6.3 file server, and soon after I > noticed that the load was consistenly at around 4, even with no obvious > activity. After checking around a bit, the only unusual thing I could > find is that the xfsaild threads are all consistently in D state: > > root 1744 0.0 0.0 0 0 ? D Nov16 7:46 [xfsaild/dm-2] > root 1756 0.0 0.0 0 0 ? D Nov16 7:44 [xfsaild/dm-1] > root 1759 0.0 0.0 0 0 ? D Nov16 7:57 [xfsaild/dm-3] > root 1762 0.0 0.0 0 0 ? D Nov16 5:59 [xfsaild/dm-0] That's a side effect of a minimal set of bug fixes that were needed to avoid a load related log space hang. Those fixes disabled the aild idling logic so the aild acts as a watchdog, so they wake up every 50ms to check if there's anything to do. You'll find that 3.0.x stable kernels have the same behaviour. The aild idling logic was re-enabled in mainstream kernels after the root cause of the log space hangs was diagnosed and fixed, but I can't see it ever being re-enabled in a CentOS 6.3 kernel.... Cheers, Dave -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
