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    SubjectRe: [Bug #12809] iozone regression with 2.6.29-rc6
    Date
    On Thursday 05 March 2009, Wu Fengguang wrote:
    > On Tue, Mar 03, 2009 at 09:25:59PM +0200, Rafael J. Wysocki wrote:
    > > This message has been generated automatically as a part of a report
    > > of recent regressions.
    > >
    > > The following bug entry is on the current list of known regressions
    > > from 2.6.28. Please verify if it still should be listed and let me know
    > > (either way).
    > >
    > >
    > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12809
    > > Subject : iozone regression with 2.6.29-rc6
    > > Submitter : Lin Ming <ming.m.lin@intel.com>
    > > Date : 2009-02-27 9:13 (5 days old)
    > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1cf6e7d83bf334cc5916137862c920a97aabc018
    > > References : http://marc.info/?l=linux-kernel&m=123572630504360&w=4
    > > Handled-By : Wu Fengguang <fengguang.wu@intel.com>
    >
    > Following Peter's idea of relaxing writeback throttling, Lin Ming
    > and I tried the idea of totally disabling writeback throttling by
    > doing benchmarks with the following parameters:
    >
    > echo 60 > /proc/sys/vm/dirty_ratio
    > echo 50 > /proc/sys/vm/dirty_background_ratio
    >
    > The result is encouraging: the iozone performance is restored to the
    > level of 2.6.29-rc5!
    >
    > We'll continue to evaluate the dirty/throttling numbers with Nick's patch.

    Thanks for the update.

    Rafael


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