Re: Scatter-gather list constraints

[Stefan Richter]

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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