Messages in this thread |  | | | From | Rusty Russell <> | | Subject | Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk | | Date | Wed, 04 Jul 2012 12:10:42 +0930 |
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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.
Am I misunderstanding something? I thought if you could have a high rate of requests, it's not a slow device.
Cheers, Rusty.
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