Messages in this thread | | | Date | Thu, 18 Mar 1999 14:49:08 -0500 | From | Arvind Sankar <> | Subject | Re: disk head scheduling |
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On Thu, Mar 18, 1999 at 08:38:21PM +0100, Rik van Riel wrote: > On Thu, 18 Mar 1999, Arvind Sankar wrote: > > > Another point is that IN_ORDER seems to be called only for two requests > > on the same device, so no idea why it compares the device numbers. > > It compares device numbers because of partitions on > one drive. It would be extremely bad for performance > when Linux would be hopping from partition to partition > without the aid of the elevator algorithm...
ah. Sorry. didn't look closely enough and thought there was one queue for every rq_dev, since the call was get_queue(req->rq_dev)
This means I need to fix my code, which btw has starvation problems... :(
-- arvind
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