From: Jeff Garzik <jgarzik@pobox.com>
To: Mark Lord <mlord@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: Mon, 20 Feb 2006 06:23:20 -0500 [thread overview]
Message-ID: <43F9A6A8.4020606@pobox.com> (raw)
In-Reply-To: <43F3B3CE.5060105@pobox.com>
Mark Lord wrote:
> Jeff Garzik wrote:
>> 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?
> 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..
Indeed. I am paranoid about controllers assuming that no more than 256
PRD entries will be submitted. But I have never seen any document that
says PCI IDE BMDMA hardware can -only- do 256 PRD entries. Never tested
it, either...
Jeff
next prev parent reply other threads:[~2006-02-20 11:23 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 4/4] libata: kill sht->max_sectors 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
2006-02-20 11:23 ` Jeff Garzik [this message]
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
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