Alex Dean wrote:
On Oct 1, 2010, at 3:32 AM, der.hans wrote:
Am 30. Sep, 2010 schwätzte Eric Shubert so:
Which elevator is being used?
(cat /sys/block/sda/queue/scheduler)
noop anticipatory deadline [cfq]
Using async i/o? Synchronous writes are very slow.
Hmm, not familiar with libaio. Looks like we have it installed.
I presume ext3, since you referred to noatime. If you have directories with
many files (e.g. Maildir), dir_index option can help.
Yeah, ext3. Mostly it's a few DB files and some log files. No mail
directories.
FWIW: A few years ago, I recall seeing somewhat-improved benchmark performance
from MySQL after switching to the deadline scheduler.
I'd give that a shot - can't hurt to try.
# echo deadline >/sys/block/sda/queue/scheduler
Also, what are the bus speeds of the various hosts? Could that be your
bottleneck?
Or cabling perhaps? Long SATA cables can be problematic. I haven't seen
a bad SATA cable yet (that I know of), but I'd try to eliminate that as
a possibility. (I detest HW problems, but they do occasionally exist)
--
-Eric 'shubes'
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