On 06/02/14 23:35, Chris Murphy wrote:
On Feb 6, 2014, at 7:43 AM, Wade Hampton <wadehampto...@gmail.com> wrote:
- mount using discard (or use the fstrim program periodically)
The discard/TRIM debate can be found in the archives and also on devel@
archives, and on XFS archives. Not all SSDs perform that well with discard
mount option because TRIM is a non-queued command, therefore for TRIM commands
to be issued the drive cache must be cleared of all other commands and this can
actually make things slower. So really it depends on your workload type, and
the SSD you're using. I wouldn't assume you must have this enabled. Pretty much
every source on this has been wrong, notable the crap resulting from coverage
of Ubuntu moving to discard by default.
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
Sam
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