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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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