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    SubjectRe: Linux 2.6.29
    On Sat, Apr 04, 2009 at 07:02:51PM -0400, Jeff Garzik wrote:
    > Is dd + sync_file_range really a realistic comparison? dd is streaming
    > as fast as the disk can output data, whereas MythTV is streaming as fast
    > as video is being recorded. If you are maxing out your disk throughput,
    > there will be obvious impact no matter what.
    > I would think a more accurate comparison would be recording multiple
    > video streams in parallel, comparing fsync/fdatasync/sync_file_range?
    > IOW, what is an average MythTV setup -- what processes are actively
    > reading/writing storage? Where are you noticing latencies, and does
    > sync_file_range decrease those areas of high latency?

    I am going to give the patch a shot. I run dual tuners after all, so
    I do get multiple streams recording while doing playback at the same time.

    Len Sorensen

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