From: Theodore Tso <tytso@mit.edu>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
James Bottomley <James.Bottomley@suse.de>,
Mark Lord <liml@rtr.ca>, Chris Worley <worleys@gmail.com>,
Matthew Wilcox <matthew@wil.cx>, Bryan Donlan <bdonlan@gmail.com>,
david@lang.hm, Greg Freemyer <greg.freemyer@gmail.com>,
Markus Trippelsdorf <markus@trippelsdorf.de>,
Matthew Wilcox <willy@linux.intel.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Nitin Gupta <ngupta@vflare.org>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org,
Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: Discard support (was Re: [PATCH] swap: send callback when swap slot is freed)
Date: Sun, 16 Aug 2009 11:44:30 -0400 [thread overview]
Message-ID: <20090816154430.GE17958@mit.edu> (raw)
In-Reply-To: <20090816083434.2ce69859@infradead.org>
On Sun, Aug 16, 2009 at 08:34:34AM -0700, Arjan van de Ven wrote:
> trim is mostly for ssd's though, and those tend to not have the "goes
> for a hike" behavior as much......
Mark Lord has claimed that the currently shipping SSD's take "hundreds
of milliseconds" for a TRIM, command. Compared to the usual latency
of an SSD, that could very well be considered "takes a coffee break"
behaviour; maybe not "goes for a hike", but enough that you wouldn't
want to be doing one all the time.
The story that I've heard which worries me is that those of us which
were silly enough to spend $400 and $800 dollars on the first
generation X25-M drives may never get TRIM support, and that TRIM
support might only be offered on the second generation X25-M drives.
I certainly _hope_ that is not true, but in any case, I don't have any
TRIM capable drives at the moment, so it's not something which I'm set
up to test....
- Ted
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next prev parent reply other threads:[~2009-08-16 15:45 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-12 14:37 [PATCH] swap: send callback when swap slot is freed Nitin Gupta
2009-08-12 22:48 ` Hugh Dickins
2009-08-13 2:30 ` Nitin Gupta
2009-08-13 6:53 ` Peter Zijlstra
2009-08-13 14:44 ` Nitin Gupta
2009-08-13 17:45 ` Hugh Dickins
2009-08-13 2:41 ` Nitin Gupta
2009-08-13 5:05 ` compcache as a pre-swap area (was: [PATCH] swap: send callback when swap slot is freed) Al Boldi
2009-08-13 17:31 ` Nitin Gupta
2009-08-14 4:02 ` Al Boldi
2009-08-14 4:53 ` compcache as a pre-swap area Nitin Gupta
2009-08-14 15:49 ` Al Boldi
2009-08-15 11:00 ` Al Boldi
2009-08-13 15:13 ` Discard support (was Re: [PATCH] swap: send callback when swap slot is freed) Matthew Wilcox
2009-08-13 15:17 ` david
2009-08-13 15:26 ` Matthew Wilcox
2009-08-13 15:43 ` James Bottomley
2009-08-13 18:22 ` Ric Wheeler
2009-08-13 16:13 ` Nitin Gupta
2009-08-13 16:26 ` Markus Trippelsdorf
2009-08-13 16:33 ` david
2009-08-13 18:15 ` Greg Freemyer
2009-08-13 19:18 ` James Bottomley
2009-08-13 20:31 ` Richard Sharpe
2009-08-14 22:03 ` Mark Lord
2009-08-14 22:54 ` Greg Freemyer
2009-08-15 13:12 ` Mark Lord
2009-08-13 20:44 ` david
2009-08-13 20:54 ` Bryan Donlan
2009-08-14 22:10 ` Mark Lord
2009-08-14 23:21 ` Chris Worley
2009-08-14 23:45 ` Matthew Wilcox
2009-08-15 0:19 ` Chris Worley
2009-08-15 0:30 ` Greg Freemyer
2009-08-15 0:38 ` Chris Worley
2009-08-15 1:55 ` Greg Freemyer
2009-08-15 13:20 ` Mark Lord
2009-08-16 22:52 ` Chris Worley
2009-08-17 2:03 ` Mark Lord
2009-08-15 12:59 ` James Bottomley
2009-08-15 13:22 ` Mark Lord
2009-08-15 13:55 ` James Bottomley
2009-08-15 17:39 ` jim owens
2009-08-16 17:08 ` Robert Hancock
2009-08-16 14:05 ` Alan Cox
2009-08-16 14:16 ` Mark Lord
2009-08-16 15:34 ` Arjan van de Ven
2009-08-16 15:44 ` Theodore Tso [this message]
2009-08-16 17:28 ` Mark Lord
2009-08-16 17:37 ` Mark Lord
2009-08-17 16:30 ` Bill Davidsen
2009-08-17 16:56 ` jim owens
2009-08-17 17:14 ` Bill Davidsen
2009-08-17 17:37 ` jim owens
2009-08-16 17:37 ` Mark Lord
2009-08-16 15:52 ` James Bottomley
2009-08-16 16:32 ` Mark Lord
2009-08-16 18:07 ` James Bottomley
2009-08-16 18:19 ` Mark Lord
2009-08-16 18:24 ` James Bottomley
2009-08-17 16:37 ` Bill Davidsen
2009-08-17 17:08 ` Greg Freemyer
2009-08-17 17:19 ` James Bottomley
2009-08-17 18:16 ` Ric Wheeler
2009-08-17 18:21 ` Greg Freemyer
2009-08-17 19:18 ` James Bottomley
2009-08-17 20:19 ` Mark Lord
2009-08-17 20:28 ` James Bottomley
2009-08-17 20:28 ` Mark Lord
2009-08-16 16:59 ` Christoph Hellwig
2009-08-17 4:24 ` Douglas Gilbert
2009-08-17 13:56 ` James Bottomley
2009-08-17 14:10 ` Matthew Wilcox
2009-08-17 19:12 ` Christoph Hellwig
2009-08-17 19:24 ` James Bottomley
2009-08-16 21:50 ` Discard support Roland Dreier
2009-08-16 22:06 ` Jeff Garzik
2009-08-16 22:13 ` Theodore Tso
2009-08-16 22:51 ` Mark Lord
2009-08-16 19:29 ` Discard support (was Re: [PATCH] swap: send callback when swap slot is freed) Alan Cox
2009-08-16 23:05 ` John Robinson
2009-08-17 2:05 ` Mark Lord
2009-08-13 21:28 ` Greg Freemyer
2009-08-13 22:20 ` Richard Sharpe
2009-08-14 0:19 ` Greg Freemyer
[not found] ` <46b8a8850908131758s781b07f6v2729483c0e50ae7a@mail.gmail.com>
2009-08-14 21:33 ` Greg Freemyer
2009-08-14 21:56 ` Discard support Roland Dreier
2009-08-14 22:10 ` Greg Freemyer
2009-08-13 17:19 ` Discard support (was Re: [PATCH] swap: send callback when swap slot is freed) Hugh Dickins
2009-08-13 18:08 ` Douglas Gilbert
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