F15 ext4 discard option - why not default?

[Thorsten Leemhuis]

On 16.03.2011 18:55, Ric Wheeler wrote:
> On 03/16/2011 01:53 PM, Michał Piotrowski wrote:
>> I installed F15 on SSD and I noticed that file systems are not mounted
>> with discard option.
>> Shouldn't "discard" option be enabled by default for SSD devices?
> 
> No - discard is off on purpose. Some SSD's work very well, others have 
> performance issues with discard and some even became unusable bricks.
> 
> The idea is to have it off by default so people can test. Over time, if things 
> go well, we can think about changing the default.

That IOW and AFAICS means that we need a whitelist or a blacklist (or
both) in the long term anyway, as those that become bricks won't simply
vanish over night.

So why not start with that now? Or is the answer simply a lack of
resources/people interested to drive things forward?

Just curious. I have a Intel SSDSA2M080G2GC for a while now but was not
bold enough yet to give discard on Ext4 a try.

Cu
 knurd