From: Ted Ts'o <tytso@mit.edu>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Lukas Czerner <lczerner@redhat.com>,
eshishki@redhat.com, rwheeler@redhat.com,
linux-ext4@vger.kernel.org, sandeen@redhat.com
Subject: Re: Ext4: batched discard support - simplified version
Date: Fri, 23 Jul 2010 11:19:25 -0400 [thread overview]
Message-ID: <20100723151925.GI13090@thunk.org> (raw)
In-Reply-To: <x49hbjqjknj.fsf@segfault.boston.devel.redhat.com>
On Fri, Jul 23, 2010 at 11:13:52AM -0400, Jeff Moyer wrote:
>
> I don't think so. In all of the configurations tested, I'm pretty sure
> we saw a performance hit from doing the TRIMs right away. The queue
> flush really hurts. Of course, I have no idea what you had in mind for
> the amount of time in between batched discards.
Sure, but not all the world is SATA-attached SSD's. I'm thinking in
particular of PCIe-attached SSD's, where the TRIM command might be
very fast indeed... I believe Ric Wheeler tells me you have TMS
RamSan SSD's in house that you are testing? And of course those
aren't the only PCIe-attached flash devices out there....
- Ted
next prev parent reply other threads:[~2010-07-23 15:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-07 7:53 Ext4: batched discard support - simplified version Lukas Czerner
2010-07-07 7:53 ` [PATCH 1/2] Add ioctl FITRIM Lukas Czerner
2010-07-07 7:53 ` [PATCH 2/2] Add batched discard support for ext4 Lukas Czerner
2010-07-14 8:33 ` Dmitry Monakhov
2010-07-14 9:40 ` Lukas Czerner
2010-07-14 10:03 ` Dmitry Monakhov
2010-07-14 11:43 ` Lukas Czerner
2010-07-23 14:36 ` Ext4: batched discard support - simplified version Ted Ts'o
2010-07-23 15:13 ` Jeff Moyer
2010-07-23 15:19 ` Ted Ts'o [this message]
2010-07-23 15:40 ` Jeff Moyer
2010-07-23 17:00 ` Ted Ts'o
2010-07-24 16:31 ` Ric Wheeler
2010-07-23 15:30 ` Greg Freemyer
2010-07-26 10:30 ` Lukas Czerner
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