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Message-ID: <20090417201342.GF26479@mit.edu>
Date: Fri, 17 Apr 2009 16:13:42 -0400
From: Theodore Tso <tytso@....edu>
To: Amit Shah <amit.shah@...hat.com>
Cc: Chris Mason <chris.mason@...cle.com>, Jan Kara <jack@...e.cz>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] Add ext3 data=guarded mode
On Fri, Apr 17, 2009 at 11:39:06PM +0530, Amit Shah wrote:
> # 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded
>
> filesystem posix-fallocate mmap chunk-4096 chunk-8192
> ext3-guarded 85 97 459 90
> ext3-writeback 86 95 140 94
> ext3-ordered 86 96 277 95
>
> Running the test in single user mode, I get the following results:
>
> # 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded
>
> filesystem posix-fallocate mmap chunk-4096 chunk-8192
> ext3-guarded 84 86 163 91
> ext3-writeback 84 88 217 91
> ext3-ordered 84 86 226 91
The difference between guarded and writeback in chunk-4096 looking at
your desktop timings and your single user times is.... surprising.
In particular, the fact that the guarded time is 3 times longer than
ext3-writeback when the desktop is running, and 20% faster in single
user mode. Are these results reproducible? And do you have any
thoughts as to what might be causing them?
- Ted
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