From: Mark Lord <mlord@pobox.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Jens Axboe <axboe@suse.de>, Tejun Heo <htejun@gmail.com>,
albertcc@tw.ibm.com, linux-ide@vger.kernel.org
Subject: Re: [PATCH] libata: increase LBA48 max sectors to 65535
Date: Wed, 15 Feb 2006 18:05:50 -0500 [thread overview]
Message-ID: <43F3B3CE.5060105@pobox.com> (raw)
In-Reply-To: <43F38D49.4080601@pobox.com>
Jeff Garzik wrote:
> Jens Axboe wrote:
>> On Thu, Feb 16 2006, Tejun Heo wrote:
>>
>>> Jens Axboe wrote:
>>>
>>>> On Wed, Feb 15 2006, Tejun Heo wrote:
>>>>
>>>>
>>>>> max_hw_sectors/max_sectors separation patch made into the tree,
>>>>> increase max_sectors to its hardware limit.
..
> Its set to 200 for a libata-related reason that I now forget :(
>
> It had nothing to do with controllers or devices, hence the FIXME.
>
> As an aside, I wonder if the PRD limit is unnecessarily low. I don't
> remember seeing anything that claimed we were limited to 256 s/g entries
> in the old IDE docs?
>
> Jeff
Well, originally I wrote ide-dma.c with a 256 PRD limit,
because that corresponds to the absolute worst case of
only one sector per PRD. The pre-LBA48 protocol cannot
read/write more than that with a single command.
But nowadays..
Cheers
--
Mark Lord
Real-Time Remedies Inc.
mlord@pobox.com
next prev parent reply other threads:[~2006-02-15 23:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-12 14:32 [PATCHSET] libata: make some configurations per-dev Tejun Heo
2006-02-12 14:32 ` [PATCH 1/4] libata: make ata_dev_knobble() per-device Tejun Heo
2006-02-12 19:29 ` Jeff Garzik
2006-02-12 14:32 ` [PATCH 2/4] libata: move cdb_len for host to device Tejun Heo
2006-02-12 14:32 ` [PATCH 3/4] libata: add per-device max_sectors Tejun Heo
2006-02-12 19:37 ` Jeff Garzik
2006-02-13 0:47 ` Tejun Heo
2006-02-13 4:58 ` Jeff Garzik
2006-02-15 7:24 ` [PATCH] libata: increase LBA48 max sectors to 65535 Tejun Heo
2006-02-15 13:07 ` Jens Axboe
2006-02-15 15:04 ` Tejun Heo
2006-02-15 15:12 ` Jens Axboe
2006-02-15 15:30 ` Tejun Heo
2006-02-15 19:03 ` Mark Lord
2006-02-15 20:21 ` Jeff Garzik
2006-02-15 23:05 ` Mark Lord [this message]
2006-02-20 11:23 ` Jeff Garzik
2006-02-20 13:54 ` Mark Lord
2006-02-20 13:58 ` Jens Axboe
2006-02-16 7:42 ` Jens Axboe
2006-02-20 11:25 ` Jeff Garzik
2006-02-20 11:44 ` Jens Axboe
2006-02-20 21:59 ` Jeff Garzik
2006-02-12 14:32 ` [PATCH 4/4] libata: kill sht->max_sectors Tejun Heo
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