Dave Pitts wrote:
Hello all:
I've been trying some hacks to boost disk I/O performance mostly by
changing values
in the /proc/sys/vm filesystem. A vmstat display shows bursty block
out counts with
fairly consistent interrupt counts:
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us
sy id wa
4 0 720 80252 1820 7077456 0 0 9 852 5 11 1
14 84 0
[...]
5 0 720 90364 1860 7067080 0 0 40 66956 17995 95384 0
17 82 0
This test is running several NFS clients to a RAID disk storage array.
I also see the
same behavior when running SFTP transfers. What I'd like is a more
even block
out behavior (even at the expense of other apps as this is a file
server not an app
server). The values that I've been hacking are the
dirty_writeback_centisecs,
dirty_background_ratio, etc. Am I barking up the wrong tree?
No iowait time, plenty of idle time: looks like you are network bound.
What time of network are you running?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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