On Feb 7, 2014, at 5:11 PM, Michael Cronenworth <mike(a)cchtml.com> wrote:
On 02/07/2014 03:00 AM, sam tygier wrote:
>
> Ubuntu will be using a cronjob that calls fstrim, not the discard mount option.
> They found that the discard option cause a small performance hit.
>
https://blueprints.launchpad.net/ubuntu/+spec/core-1311-ssd-trimming
If you read the link you posted you will find that their discard testing is inconclusive.
They only tested 2 SSDs.
The whole discard vs. fstrim debate is entirely speculation. I haven't seen any fs
maintainer speak up on either side either. The debate has been limited to blog posters and
vocal end-users with their opinions.
Well it's an old topic for them, you have to go back 3+ years, which is maybe not what
you expect when only in the last few months some loud mouths on /. and Engadget shriek
ZOMG Linux just now is getting TRIM?! And how basic this is on Windows and OS X (despite
OS X only enabling trim for Apple branded SSDs).
Theodore T'so has spoken up on the ext4 list, as have others:
http://www.spinics.net/lists/linux-ext4/msg13071.html
Dave Chinner has said some things about it on the XFS list, as have others:
http://oss.sgi.com/archives/xfs/2013-07/msg00922.html
http://oss.sgi.com/archives/xfs/2011-05/msg00338.html
And there's a pile of discard/trim conversations on LKML, LVM, Btrfs, on and on.
Chris Murphy