Re: Linux 2.6.29

[Lennart Sorensen]

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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