From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-ide@vger.kernel.org, torvalds@osdl.org
Subject: Re: libata: set queue SSD flag for SSD devices
Date: Sat, 11 Oct 2008 09:33:37 +0200 [thread overview]
Message-ID: <1223710417.4159.11.camel@localhost.localdomain> (raw)
In-Reply-To: <20081010175508.3d1ed2a4@infradead.org>
On Fri, 2008-10-10 at 17:55 -0700, Arjan van de Ven wrote:
> On Fri, 10 Oct 2008 22:05:28 +0200
> Jens Axboe <jens.axboe@oracle.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)
For libata, the is ssd is the right test.
For things like the symmetrix we probably need to look at the caching
mode page and treat it like ssd if the cache is say > 1GB or whatever
heuristic is needed.
James
next prev parent reply other threads:[~2008-10-11 7:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200810101904.m9AJ42Gq018897@hera.kernel.org>
2008-10-10 19:25 ` libata: set queue SSD flag for SSD devices Alan Cox
2008-10-10 20:05 ` Jens Axboe
2008-10-11 0:55 ` Arjan van de Ven
2008-10-11 6:36 ` Jens Axboe
2008-10-11 7:33 ` James Bottomley [this message]
2008-10-11 14:06 ` Jens Axboe
2008-10-11 15:44 ` James Bottomley
2008-10-11 16:04 ` Arjan van de Ven
2008-10-11 16:38 ` James Bottomley
2008-10-11 16:49 ` Arjan van de Ven
2008-10-11 17:48 ` Jens Axboe
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