Re: Discard support (was Re: [PATCH] swap: send callback when swap slot is freed)

James Bottomley wrote:

On Mon, 2009-08-17 at 14:21 -0400, Greg Freemyer wrote:

quoted

On Mon, Aug 17, 2009 at 1:19 PM, James Bottomley[off-list ref] wrote:

quoted

On Mon, 2009-08-17 at 13:08 -0400, Greg Freemyer wrote:

..

quoted

quoted

quoted

Non-coalescing is believed detrimental,

It is?  Why?

For the only compliant SSD in the wild, Mark has shown it to be true
via testing.

He only said larger trims take longer.  As I said previously, if it's a
X+nY relationship, then we still benefit from accumulation up to some
value of n.

..

Err, what I said was, "rm -rf /usr/src/linux" takes over half an hour
with uncoalesced TRIM, and only a scant few seconds in total *with*
coalesced TRIM.