* compression performance/scalability
@ 2009-04-15 13:44 mp3geek
2009-04-15 14:26 ` Chris Mason
0 siblings, 1 reply; 2+ messages in thread
From: mp3geek @ 2009-04-15 13:44 UTC (permalink / raw)
To: linux-btrfs
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?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: compression performance/scalability
2009-04-15 13:44 compression performance/scalability mp3geek
@ 2009-04-15 14:26 ` Chris Mason
0 siblings, 0 replies; 2+ messages in thread
From: Chris Mason @ 2009-04-15 14:26 UTC (permalink / raw)
To: mp3geek; +Cc: linux-btrfs
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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