Messages in this thread | | | Date | Fri, 1 Mar 2002 16:22:02 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: queue_nr_requests needs to be selective |
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On Fri, Mar 01, 2002 at 09:03:22PM +0000, Alan Cox wrote: > > I don't immediately see why increasing the queue length should > > increase bandwidth in this manner. One possibility is that > > Latency on the controllers ? With caches on the controller and disks you > can have a lot of requests actually in flight
Since 3ware uses a switched architecture, there are a lot of requests in flight. Can we get the default value increased or alternately, allow RAID drivers to submit a local queue_nr_request value per adapter so for those cards with 8 drives that make themselves look like a single drive to Linux, sufficient buffers are available to prevent threads feeding the device from going to sleep all the time?
:-)
Jeff
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