F15 ext4 discard option - why not default?

[Ric Wheeler]

On 03/16/2011 01:53 PM, Michał Piotrowski wrote:
> Hi,
>
> 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.

Ric