linux-kernel - Re: Discard support

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Message-ID: <4A8882E0.5070207@garzik.org>
Date:	Sun, 16 Aug 2009 18:06:24 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Roland Dreier <rdreier@...co.com>
CC:	James Bottomley <James.Bottomley@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Mark Lord <liml@....ca>,
	Chris Worley <worleys@...il.com>,
	Matthew Wilcox <matthew@....cx>,
	Bryan Donlan <bdonlan@...il.com>, david@...g.hm,
	Greg Freemyer <greg.freemyer@...il.com>,
	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

On 08/16/2009 05:50 PM, Roland Dreier wrote:
>
>   >  Well, yes and no ... a lot of SSDs don't actually implement NCQ, so the
>   >  impact to them will be less ... although I think enterprise class SSDs
>   >  do implement NCQ.
>
> Really?  Which SSDs don't implement NCQ?

ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata3.00: ATA-8: G.SKILL 128GB SSD, 02.10104, max UDMA/100
ata3.00: 250445824 sectors, multi 0: LBA
ata3.00: configured for UDMA/100

for one...

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