linux-kernel - Re: Scatter-gather list constraints

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Date:	Mon, 23 Jun 2008 23:53:30 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	David Vrabel <david.vrabel@....com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	AntonioLin <antonio.lin@...ormicro.com>,
	linux-usb@...r.kernel.org,
	"Perez-Gonzalez, Inaky" <inaky.perez-gonzalez@...el.com>
Subject: Re: Scatter-gather list constraints

Alan Stern wrote:
> On Mon, 23 Jun 2008, David Vrabel wrote:
>> Can the number of entries in a sg list be limited?  e.g., if the
>> hardware only had support for say, 64 entries?
> 
> Yes, there are two fields in struct request_queue for this: 
> max_phys_segments (the driver's limit) and max_hw_segments (the 
> hardware's limit).

David, also have a look at <linux/blkdev.h> from the comment "Access 
functions for manipulating queue properties" downwards for accessors to 
request queue tunables.
-- 
Stefan Richter
-=====-==--- -==- =-===
http://arcgraph.de/sr/
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