linux-kernel - Re: Discard support

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Message-ID: <adavdkn2ztb.fsf@cisco.com>
Date:	Sun, 16 Aug 2009 14:50:40 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	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


 > 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?

It seems that one couldn't keep the flash busy doing only one command at time.
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