linux-kernel - Re: libata: set queue SSD flag for SSD devices

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Message-ID: <20081011063650.GL19428@kernel.dk>
Date:	Sat, 11 Oct 2008 08:36:51 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, torvalds@...l.org
Subject: Re: libata: set queue SSD flag for SSD devices

On Fri, Oct 10 2008, Arjan van de Ven wrote:
> On Fri, 10 Oct 2008 22:05:28 +0200
> Jens Axboe <jens.axboe@...cle.com> wrote:
> > 
> > In this specific patch, it'll do no harm at least since I very much
> > doubt we'll see a false positive. And even if, the consequences wont
> > be dire. But it does want the version check, of course.
> > 
> 
> also, is "is an ssd" the right question or is "doesn't have seek
> latency" the right one?
> (difference is.. well EMC boxes with lots of ram etc)

The block layer uses the 'non rotational' nomenclature for this, but
that's not perfect either. And neither is 'no seek', a single
"parameter" is not enough to describe the device. But it's good enough I
think, it'll be expanded later with a (bit) fuller profile.

-- 
Jens Axboe

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