Re: compression performance/scalability

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On Thu, 2009-04-16 at 01:44 +1200, mp3geek wrote:
> I'm using btrfs (from 2.6.29.1) on my mythtv box, and I've found
> issues recording 2 channels with compression enabled. (2 seperate
> DVB-S cards, recording 2 seperate channels at the same time). One
> recording will be fine, but the other recording will be broken.. file
> is damaged and basically unplayable. Seems better when compression
> isn't enabled when saving 2 streams at the same time, both files
> record fine.. will the performance improve in the upcoming 2.6.30?

This isn't really a performance problem, that sounds like a compression
bug.  I do a bunch of parallel testing on the compression code, and
streaming writes is a pretty simple workload.

So, do you have anything in dmesg about the second file?  Checksum
errors or anything like that?

-chris


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