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

[Matthew Wilcox]

On Fri, Aug 14, 2009 at 05:21:32PM -0600, Chris Worley wrote:
> Sooner is better than waiting to coalesce.  The longer an LBA is
> inactive, the better for any management scheme.  If you wait until
> it's reused, you might as well forgo the advantages of TRIM/UNMAP.  If
> a the controller wants to coalesce, let it coalesce.

I'm sorry, you're wrong.  There is a tradeoff point, and it's different
for each drive model.  Sending down a steady stream of tiny TRIMs is
going to give terrible performance.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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