Re: high load, no bottleneck

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

> I confirm. Indeed this is weird.
Yes. I would try finding out who causes this.

> But how small write could kill WAPBL performances?
I don't think it would. However, the amount of filesync writes may still be the 
problem. The missing data (for me) is how often your WAPBL journal gets flushed
(because of these filesync writes). If this happens once a second or even more
often, it may completly stall your discs. One filesync write causes one journal
flush which causes two disc cache flushes.

Additionally, every single small sync write will cause one RAID stripe RMW.
How large are your stripes, btw.?