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    SubjectRe: How can I boost block I/O performance
    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).



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