From: Anthony Wesley <awesley@acquerra.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: nate.diller@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: kernel 2.6.13 buffer strangeness - ext2/3/reiser4/xfs comparison
Date: Sat, 10 Sep 2005 21:56:15 +1000 [thread overview]
Message-ID: <4322C9DF.1090704@acquerra.com.au> (raw)
In-Reply-To: <20050910044240.4e8e8e03.akpm@osdl.org>
Andrew Morton wrote:
> Anthony Wesley <awesley@acquerra.com.au> wrote:
>
>>I compared ext2,ext3,xfs,vfat,reiser and reiser4.
>>
>> The hands-down winner was ext2. All the others showed problems of either lower disk throughput
>> or dropped frames during video capture.
>
>
> ext2 is a good filesystem. For that sort of application all the journaling
> gunk can really get in the way.
>
> You should have tested ext3 with data=writeback.
>
Ask and ye shall receive...
I created an ext3 fs, mounted it with data=writeback and gave it a quick spin.
The result? Lots of pauses and dropped frames during capture. This is during the part of the
process where I have gobs of free RAM that's being used for buffering so dropping frames here
is a cardinal sin.
Dunno why it's happening, but I saw it also with xfs and reiser4. ext2 on the other hand
chugs along happily, no pauses, no dropped frames until we run out of free RAM (takes about 2
minutes now after the simple kernel change).
I can understand dropped frames after we run out of ram, but not before.
regards, Anthony
--
Anthony Wesley
Director and IT/Network Consultant
Smart Networks Pty Ltd
Acquerra Pty Ltd
Anthony.Wesley@acquerra.com.au
Phone: (02) 62595404 or 0419409836
next prev parent reply other threads:[~2005-09-10 11:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-09 9:11 kernel 2.6.13 buffer strangeness Anthony Wesley
2005-09-09 15:09 ` Roger Heflin
2005-09-09 21:39 ` Nate Diller
2005-09-10 0:16 ` Anthony Wesley
2005-09-10 0:35 ` Nate Diller
2005-09-10 1:07 ` Anthony Wesley
2005-09-10 1:47 ` Nate Diller
2005-09-10 2:23 ` Anthony Wesley
[not found] ` <5c49b0ed05090922021b8f8112@mail.gmail.com>
2005-09-10 5:32 ` Anthony Wesley
2005-09-10 6:02 ` kernel 2.6.13 buffer strangeness - FIXED Anthony Wesley
2005-09-10 10:23 ` kernel 2.6.13 buffer strangeness - ext2/3/reiser4/xfs comparison Anthony Wesley
2005-09-10 11:42 ` Andrew Morton
2005-09-10 11:56 ` Anthony Wesley [this message]
2005-09-10 0:50 ` kernel 2.6.13 buffer strangeness Anthony Wesley
2005-09-10 5:41 ` Andrew Morton
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