From: Jeff Garzik <jeff@garzik.org>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: Alok kataria <alokkataria1@gmail.com>, linux-ide@vger.kernel.org
Subject: Re: use_clustering (sht) bit set to 0 in AHCI ?
Date: Thu, 24 May 2007 23:06:04 -0400 [thread overview]
Message-ID: <4656529C.4050701@garzik.org> (raw)
In-Reply-To: <20070522074538.GP4705@kernel.dk>
Jens Axboe wrote:
> On Mon, May 21 2007, Jeff Garzik wrote:
>> Jens Axboe wrote:
>>> ahci has always had clustering disabled, perhaps Jeff can expand on why?
>>
>> Just historical reasons. libata had clustering disabled by default in
>> the beginning, for all drivers. Then we enabled it globally by changing
>> the value of ATA_SHT_USE_CLUSTERING... but apparently forgot to change
>> drivers which use their own value rather than ATA_SHT_USE_CLUSTERING.
>>
>> Feel free to submit a patch turning it on...
>
> The below works for me, but it's only lightly tested. I booted it up and
> ran some large IO tests, I've verified really large IO sizes as well
> (using blktrace, I've verified ios up to 9216KiB being accepted and
> completed by the drive).
>
> -----
>
> From: Jens Axboe <jens.axboe@oracle.com>
>
> ahci: enable sg segment clustering
>
> The specification states that ahci supports segments up to 4MiB in size,
> so enable clustering.
>
> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
applied
prev parent reply other threads:[~2007-05-25 3:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-26 5:49 use_clustering (sht) bit set to 0 in AHCI ? Alok kataria
2007-05-21 12:17 ` Jens Axboe
2007-05-21 21:17 ` Jeff Garzik
2007-05-22 7:45 ` Jens Axboe
2007-05-25 3:06 ` Jeff Garzik [this message]
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