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From: Christoph Hellwig <hch@infradead.org>
To: Kai Makisara <Kai.Makisara@kolumbus.fi>
Cc: Matthew Wilcox <matthew@wil.cx>,
	linux-scsi@vger.kernel.org, Jens Axboe <axboe@suse.de>
Subject: Re: [PATCH 09/10] Enable clustering and large transfers
Date: Sat, 1 Apr 2006 18:03:45 +0100	[thread overview]
Message-ID: <20060401170345.GA4029@infradead.org> (raw)
In-Reply-To: <Pine.LNX.4.63.0604011656490.10426@kai.makisara.local>

On Sat, Apr 01, 2006 at 05:35:13PM +0300, Kai Makisara wrote:
> I have done some more investigation based on the message from Gerard 
> Roudier that Jens found. I fetched the FreeBSD driver. It had a 
> work-around for the 896 rev. 1 chips but I did not find that in the Linux 
> version. The work-around does build two device s/g elements for any 
> original s/g segment that crosses a 16 MB boundary.
> 
> In Linux we can do that by setting the .dma_boundary field in the 
> scsi_host_template. Would it be an acceptable solution to set the 16 MB 
> limit for all sym53c8xx adapters? It would take care of the known errata 
> and Gerards suspicions about possible problems with other chips.

We can also set the flag in the scsi_host so not all adapters are punished.


  reply	other threads:[~2006-04-01 17:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-28 16:03 [PATCH 09/10] Enable clustering and large transfers Matthew Wilcox
2006-04-01 14:35 ` Kai Makisara
2006-04-01 17:03   ` Christoph Hellwig [this message]
2006-04-01 20:26     ` Kai Makisara
2006-04-01 20:22   ` Douglas Gilbert
2006-04-02 14:18     ` Kai Makisara

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