On Sun, 3 Jul 2011 05:45:17 AM Calvin Walton wrote:

> The discard option is not currently automatically enabled; I think
> there may have been some performance issues in certain cases with
> drives that have slow trim implementations. But feel free to give
> it a try.

This LWN article from 2009 explains why it can be problematic
(especially on SATA drives where TRIM is a non-queued command):

https://lwn.net/Articles/347511/

cheers,
Chris
-- 
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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