Messages in this thread | | | Date | Fri, 06 Jul 2012 09:03:16 +0800 | From | Asias He <> | Subject | Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk |
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On 07/04/2012 10:40 AM, Rusty Russell wrote: > On Tue, 03 Jul 2012 08:39:39 +0800, Asias He <asias@redhat.com> wrote: >> On 07/02/2012 02:41 PM, Rusty Russell wrote: >>> Sure, our guest merging might save us 100x as many exits as no merging. >>> But since we're not doing many requests, does it matter? >> >> We can still have many requests with slow devices. The number of >> requests depends on the workload in guest. E.g. 512 IO threads in guest >> keeping doing IO. > > You can have many requests outstanding. But if the device is slow, the > rate of requests being serviced must be low.
Yes.
> Am I misunderstanding something? I thought if you could have a high > rate of requests, it's not a slow device.
Sure.
-- Asias
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