Messages in this thread | | | Date | Sat, 06 May 2006 22:32:52 +0300 | From | Avi Kivity <> | Subject | Re: How can I boost block I/O performance |
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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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