Poor performance using discard

[Jeffrey Hundstad]

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