From: Jens Axboe <axboe@suse.de>
To: Mark Lord <mlord@pobox.com>
Cc: Jeff Garzik <jgarzik@pobox.com>, 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 14:58:10 +0100 [thread overview]
Message-ID: <20060220135809.GK8852@suse.de> (raw)
In-Reply-To: <43F9CA10.8000206@pobox.com>
On Mon, Feb 20 2006, Mark Lord wrote:
> Jeff Garzik wrote:
> >
> >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...
>
> The hardware vendors I have worked with have never had any limit
> on PRD count -- they'd happily keep reading through an infinite
> list of PRDs if we could supply one.
>
> A number of them did have issues with 64KB boundary crossings,
> and it is generally VERY unsafe to have a single PRD "wrap"
> into a fresh 64KB segment mid-stride.
Both IDE and libata take care not to make that happen, so we should be
fine there. The block layer also supports this property.
--
Jens Axboe
next prev parent reply other threads:[~2006-02-20 13:58 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 2/4] libata: move cdb_len for host to device 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 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
2006-02-20 13:54 ` Mark Lord
2006-02-20 13:58 ` Jens Axboe [this message]
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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