Messages in this thread | | | Date | Sat, 06 May 2006 15:17:02 -0600 | From | Dave Pitts <> | Subject | Re: How can I boost block I/O performance |
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Avi Kivity wrote:
> 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? > Well, it's an 8 cpu system. Does the idle time reflect the idle time of all cpu's? The network is a Gigabit Ethernet.
-- Dave Pitts PULLMAN: Travel and sleep in safety and comfort. dpitts@cozx.com My other RV IS a Pullman (Colorado Pine). http://www.cozx.com/~dpitts
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