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Re: Poor performance using discard

To: xfs@xxxxxxxxxxx
Subject: Re: Poor performance using discard
From: Jeffrey Hundstad <jeffrey.hundstad@xxxxxxxx>
Date: Mon, 05 Mar 2012 00:41:24 -0600
In-reply-to: <20120305030254.GA3592@dastard>
References: <1330469778.9688.7.camel@core24> <20120229012259.GW3592@dastard> <1330480826.9688.23.camel@core24> <20120229040819.GZ3592@dastard> <1330702910.6438.40.camel@core24> <20120305030254.GA3592@dastard>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20120216 Icedove/8.0
On 03/04/2012 09:02 PM, Dave Chinner wrote:
On Fri, Mar 02, 2012 at 10:41:50AM -0500, Thomas Lynema wrote:
Peter was right then.  Per multiple recommendations
I'm switching to fstrim, it is quicker than the deletes.

fstrim consistently takes about a minute to run on a 40GB
volume.

time fstrim -v /usr
/usr: 9047117824 bytes were trimmed

real    0m56.121s
user    0m0.090s
sys     0m0.000s

I see that the running of fstrim was already discussed
http://oss.sgi.com/archives/xfs/2011-05/msg00338.html.

Please add something to the FAQ about using SSDs.  It would be great if
people could see the recommended mount options and fstrim crontab entry
(or other option) for running xfs on a SSD.
It's a publicly modifiable wiki. Feel free to add what you've
learned here to a new FAQ entry - others will come by and correct
anything in it that is inaccurate....

And it is already there:
http://xfs.org/index.php/FITRIM/discard

Feel free to expand it.

--
Jeffrey Hundstad

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