From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Mason Subject: Re: compression performance/scalability Date: Wed, 15 Apr 2009 10:26:25 -0400 Message-ID: <1239805585.4330.1.camel@think.oraclecorp.com> References: Mime-Version: 1.0 Content-Type: text/plain Cc: linux-btrfs@vger.kernel.org To: mp3geek Return-path: In-Reply-To: List-ID: 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