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275
2007 Sep 13
3
3Ware 9550SX and latency/system responsiveness
...'ve tried CentOS 4.4,
4.5, RHEL AS 4 update 5 (just in case) and openSUSE 10.2 and they all
show the same symptoms.
Googling around makes me think that this may be related to queue
depth, nr_requests and possibly VM params (the latter from
https://bugzilla.redhat.com/show_bug.cgi?id=121434#c275). These are
the default settings:
/sys/block/sda/device/queue_depth = 254
/sys/block/sda/queue/nr_requests = 8192
/proc/sys/vm/dirty_expire_centisecs = 3000
/proc/sys/vm/dirty_ratio = 30
3Ware mentions elevator=deadline, blockdev --setra 16384 along with
nr_requests=512 in their performance tun...