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    SubjectRe: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ
    Hi Jeff,

    On 06/23/2010 05:34 AM, Jeff Moyer wrote:
    > Hi,
    > Running iozone with the fsync flag, or fs_mark, the performance of CFQ is
    > far worse than that of deadline for enterprise class storage when dealing
    > with file sizes of 8MB or less. I used the following command line as a
    > representative test case:
    > fs_mark -S 1 -D 10000 -N 100000 -d /mnt/test/fs_mark -s 65536 -t 1 -w 4096 -F
    > When run using the deadline I/O scheduler, an average of the first 5 numbers
    > will give you 448.4 files / second. CFQ will yield only 106.7. With
    > this patch series applied (and the two patches I sent yesterday), CFQ now
    > achieves 462.5 files / second.
    which 2 patches? Could you paste the link or the subject? Just want to
    make my test env like yours. ;)
    As Joel mentioned in another mail, ocfs2 also use jbd/jbd2, so I'd like
    to give it a try and give you some feedback about the test.

    > This patch set is still an RFC. I'd like to make it perform better when
    > there is a competing sequential reader present. For now, I've addressed
    > the concerns voiced about the previous posting.
    > Review and testing would be greatly appreciated.
    > Thanks!
    > Jeff
    > ---
    > New from the last round:
    > - removed the think time calculation I added for the sync-noidle service tree
    > - replaced above with a suggestion from Vivek to only guard against currently
    > active sequential readers when determining if we can preempt the sync-noidle
    > service tree.
    > - bug fixes
    > Over all, I think it's simpler now thanks to the suggestions from Jens and
    > Vivek.
    > [PATCH 1/3] block: Implement a blk_yield function to voluntarily give up the I/O scheduler.
    > [PATCH 2/3] jbd: yield the device queue when waiting for commits
    > [PATCH 3/3] jbd2: yield the device queue when waiting for journal commits
    > --
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