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

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Date:	Mon, 17 Aug 2009 15:28:12 -0500
From:	James Bottomley <James.Bottomley@...e.de>
To:	Mark Lord <liml@....ca>
Cc:	Greg Freemyer <greg.freemyer@...il.com>,
	Bill Davidsen <davidsen@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Chris Worley <worleys@...il.com>,
	Matthew Wilcox <matthew@....cx>,
	Bryan Donlan <bdonlan@...il.com>, david@...g.hm,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Nitin Gupta <ngupta@...are.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	Linux RAID <linux-raid@...r.kernel.org>
Subject: Re: Discard support (was Re: [PATCH] swap: send callback when swap
 slot is freed)

On Mon, 2009-08-17 at 16:19 -0400, Mark Lord wrote:
> James Bottomley wrote:
> > On Mon, 2009-08-17 at 14:21 -0400, Greg Freemyer wrote:
> >> On Mon, Aug 17, 2009 at 1:19 PM, James Bottomley<James.Bottomley@...e.de> wrote:
> >>> On Mon, 2009-08-17 at 13:08 -0400, Greg Freemyer wrote:
> ..
> >>>> 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.

Yes, sorry, missed the Non- when I read that sentence.

James


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