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    SubjectRe: [Bug #13726] fio sync read 4k block size 35% regression
    On Tue, Jul 07, 2009 at 02:06:42PM +0800, Zhang, Yanmin wrote:
    > On Tue, 2009-07-07 at 02:01 +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 2.6.30. Please verify if it still should be listed and let me know
    > > (either way).
    > >
    > >
    > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13726
    > > Subject : fio sync read 4k block size 35% regression
    > > Submitter : Zhang, Yanmin <yanmin_zhang@linux.intel.com>
    > > Date : 2009-07-01 11:25 (6 days old)
    > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=51daa88ebd8e0d437289f589af29d4b39379ea76
    > > References : http://lkml.org/lkml/2009/6/30/679
    > > Handled-By : Wu Fengguang <fengguang.wu@intel.com>
    > Fengguang,
    >
    > I'm still working on it now. The new testing against 2.6.31-rc2 is ongoing.
    > fio sync/mmap read has new behavior. I did collect some data. But suddenly
    > with new created data, the fio_sync_read_4k regression disappeared, while
    > fio_mmap_read is still there. Originally, the testing and bisect were stable.
    > Let me check what happens firstly.

    OK, thank you for the update.

    > Just update.
    > 
    > How did you test your new readahead patches before sending to LKML?

    I run various workloads and check if the readahead traces are abnormal.
    In this regression case, the readahead traces are in fact normal :)

    Thanks,
    Fengguang
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