From: Jeff Garzik <jeff@garzik.org>
To: Mark Lord <kernel@teksavvy.com>
Cc: Christoph Hellwig <hch@lst.de>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
James.Bottomley@suse.de, snitzer@redhat.com, axboe@kernel.dk,
linux-scsi@vger.kernel.org, dm-devel@redhat.com,
linux-ide@vger.kernel.org
Subject: Re: [RFC 1/2] block: implement an unprep function corresponding directly to prep
Date: Mon, 05 Jul 2010 18:00:28 -0400 [thread overview]
Message-ID: <4C3255FC.9060503@garzik.org> (raw)
In-Reply-To: <4C3254A3.6080709@teksavvy.com>
On 07/05/2010 05:54 PM, Mark Lord wrote:
>> On 05/07/10 03:24 PM, Christoph Hellwig wrote:
>>>
>>> What codebase were you testing on? Sorry, but curently I'm a bit lost
>>> in the maze of patches. I've got both and intel and an OCZ SSD
> ..
>
> Do you, or anyone else with one, know what the upper limit is on
> TRIM operations with the Intel SSDs ?
>
> I need to know the maximum amount of TRIM ranges they will process
> in a single command.
>
> Eg. Indilinx-based SSDs don't appear to have a limit -- they'll accept
> a TRIM command with thousands of LBA ranges included.
>
> Sandforce-based SSDs appear to restrict things to max 4KB of range data.
>
> So.. what about Intel?
Lovely :( I wonder if we could test for that limit at mke2fs time, or
similar.
Seeing a 4k limit on other SSDs would not surprise me. Or even a 512-b
limit.
Jeff
next prev parent reply other threads:[~2010-07-05 22:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 17:01 [RFC 1/2] block: implement an unprep function corresponding directly to prep James Bottomley
2010-06-30 17:10 ` [RFC 2/2] sd: free discard page in unprep function James Bottomley
2010-06-30 17:23 ` [RFC 1/2] block: implement an unprep function corresponding directly to prep Mike Snitzer
2010-06-30 17:51 ` Jens Axboe
2010-06-30 17:54 ` Martin K. Petersen
2010-07-01 1:47 ` FUJITA Tomonori
2010-07-01 3:47 ` Mike Snitzer
2010-07-01 4:44 ` [dm-devel] " FUJITA Tomonori
2010-07-02 11:03 ` Christoph Hellwig
2010-07-05 7:00 ` FUJITA Tomonori
2010-07-05 19:24 ` Christoph Hellwig
2010-07-05 21:50 ` Mark Lord
2010-07-05 21:54 ` Mark Lord
2010-07-05 22:00 ` Jeff Garzik [this message]
2010-08-03 3:01 ` Mark Lord
2010-07-06 7:04 ` FUJITA Tomonori
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