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Re: Poor performance using discard

To: Thomas Lynema <lyz27@xxxxxxxxx>
Subject: Re: Poor performance using discard
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 5 Mar 2012 14:02:54 +1100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1330702910.6438.40.camel@core24>
References: <1330469778.9688.7.camel@core24> <20120229012259.GW3592@dastard> <1330480826.9688.23.camel@core24> <20120229040819.GZ3592@dastard> <1330702910.6438.40.camel@core24>
User-agent: Mutt/1.5.21 (2010-09-15)
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....


Dave Chinner

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