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SubjectRe: How can I boost block I/O performance
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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