Messages in this thread | | | Date | Sun, 07 May 2006 08:13:31 +0300 | From | Avi Kivity <> | Subject | Re: How can I boost block I/O performance |
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Dave Pitts wrote: > Avi Kivity wrote: > >> Dave Pitts wrote: >>> >>> 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?
It's an average across all cpus. But the numbers are low even for a single cpu system.
> The network is a Gigabit Ethernet. >
I'd make sure the nics know that by running ethtool (on the clients as well as on the server).
-- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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