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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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