Re: Poor performance using discard

[Jeffrey Hundstad <jeffrey.hundstad@xxxxxxxx>]

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