From: Michael Weissenbacher <mw@dermichi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: Is it possible to change sunit of log section post-mkfs
Date: Tue, 3 Nov 2015 20:32:14 +0100 [thread overview]
Message-ID: <56390BBE.6030102@dermichi.com> (raw)
In-Reply-To: <20151103191132.GD19199@dastard>
Hi Dave!
>>
>> What i want to achieve is to set the log sunit to the maximum possible
>> of 64 blks (=256KiB).
On 2015-11-03 20:11, Dave Chinner wrote:
>
> Why? Is there a performance problem with the default setting?
>
I am seeing very bad performance of "rm" on this file system. Of course
I know that RAID-6 is kind of a worst case setup for that workload. But
I was hoping that aligning the log correctly plus increasing the stripe
size would help. Wouldn't the file system write more of the log at once
with a bigger sunit size; resulting in fewer RMW cycles?
I am already using delaylog, inode64, nobarrier to mount the fs;
lazy-count=1.
Maybe moving to an external log would be the best option?
tia,
Michael
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next prev parent reply other threads:[~2015-11-03 19:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-03 12:18 Is it possible to change sunit of log section post-mkfs Michael Weissenbacher
2015-11-03 13:02 ` Brian Foster
2015-11-03 19:22 ` Michael Weissenbacher
2015-11-03 19:39 ` Brian Foster
2015-11-03 19:11 ` Dave Chinner
2015-11-03 19:32 ` Michael Weissenbacher [this message]
2015-11-03 19:48 ` Dave Chinner
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