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SubjectRe: 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
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