From: Jeff Garzik <jeff@garzik.org>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: "Jörn Engel" <joern@logfs.org>, "Theodore Tso" <tytso@mit.edu>,
"Matthew Wilcox" <willy@linux.intel.com>,
"Ric Wheeler" <rwheeler@redhat.com>,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: Is TRIM/DISCARD going to be a performance problem?
Date: Mon, 11 May 2009 11:43:44 -0400 [thread overview]
Message-ID: <4A0847B0.1070507@garzik.org> (raw)
In-Reply-To: <20090511101815.GR4694@kernel.dk>
Jens Axboe wrote:
>>> The only problem with SSD's is the people who designed the ATA TRIM
>>> command requires us to completely drian the I/O queue before issuing
>>> it. Because of this incompetence, we need to be a bit more careful
>>> about how we issue them.
>> And this bit that I wasn't aware of. Such a requirement in the standard
>> is a trainwreck indeed.
>
> Precisely, but that's how basically anything works with SATA NCQ, only
> read/write dma commands may be queued. Anything else requires an idle
> drive before issue.
Very true -- but FWIW, one option being considered at T13 is having a
queue-able TRIM.
Jeff
next prev parent reply other threads:[~2009-05-11 15:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-09 21:14 Is TRIM/DISCARD going to be a performance problem? Theodore Ts'o
2009-05-10 16:53 ` Jörn Engel
2009-05-11 8:37 ` Theodore Tso
2009-05-11 10:06 ` Jörn Engel
2009-05-11 10:18 ` Jens Axboe
2009-05-11 15:43 ` Jeff Garzik [this message]
2009-05-11 11:27 ` Theodore Tso
2009-05-11 12:09 ` Theodore Tso
2009-05-11 13:10 ` Greg Freemyer
2009-05-11 13:39 ` Matthew Wilcox
2009-05-11 14:27 ` Theodore Tso
2009-05-11 14:29 ` Ric Wheeler
2009-05-11 14:50 ` Theodore Tso
2009-05-11 14:58 ` Ric Wheeler
2009-05-11 15:00 ` Matthew Wilcox
2009-05-11 18:47 ` Greg Freemyer
2009-05-11 19:22 ` Andreas Dilger
2009-05-11 23:38 ` Neil Brown
2009-05-12 13:28 ` Greg Freemyer
2009-05-11 13:15 ` Ric Wheeler
2010-04-24 17:11 ` Phillip Susi
2009-05-11 12:43 ` Jörn Engel
2009-05-11 12:48 ` Matthew Wilcox
[not found] ` <f3177b9e0905111433i40e41c90r920d7ccf36442ffd@mail.gmail.com>
2009-05-11 22:03 ` Chris Worley
2009-05-11 16:30 ` Chris Worley
2009-05-11 8:12 ` Jens Axboe
2009-05-11 8:41 ` Theodore Tso
2009-05-11 8:49 ` Jens Axboe
2009-05-11 17:18 ` Chris Mason
2009-05-11 18:43 ` Matthew Wilcox
2009-05-11 18:53 ` Chris Mason
2009-05-11 19:19 ` Theodore Tso
2009-05-29 10:52 ` Florian Weimer
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