> I think that Linux never used a systemwide request queue. We have a shared
> systemwide "free requests" pool, but each major has its own request queue.
>
> All block devices are using the code in drivers/block/ll_rw_blk.c to
> sort their request queue. The code supports several queues per major
> by the function get_queue(), which accepts a kdev_t and returns a pointer
> to the head of the queue. Usually, a single queue is returned for each
> major.
So what should we do to improve request sorting?
Where should we start?
Rik.
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