On Sat, Aug 28 2004, William Lee Irwin III wrote:

quoted

It certainly appears to be the deciding factor from the thread.

On Sun, Aug 29, 2004 at 06:54:59PM +0200, Jens Axboe wrote:

Has nothing to do with the io scheduler itself, apart from the fact that
CFQ exposes the problem by setting a larger q->nr_requests. And that is
the very deciding factor, not the io scheduler.

Then it's narrower still, q->nr_requests. What a priori reasons are
there for this to vomit? clear_queue_congested() seems to be called
only when a request is retired, so a large number of requests in flight
may be doing something unexpected, and I'd expect large q->nr_requests
to keep large numbers of requests around. Hmm...


-- wli
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>