Messages in this thread | | | Date | Tue, 03 Jul 2012 22:02:05 +0800 | From | Asias He <> | Subject | Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk |
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On 07/03/2012 09:31 PM, Paolo Bonzini wrote: > Il 02/07/2012 08:41, Rusty Russell ha scritto: >>> With the same workload in guest, the guest fires 200K requests to host >>> with merges enabled in guest (echo 0 > /sys/block/vdb/queue/nomerges), >>> while the guest fires 40000K requests to host with merges disabled in >>> guest (echo 2 > /sys/block/vdb/queue/nomerges). This show that the merge >>> in block layer reduces the total number of requests fire to host a lot >>> (40000K / 200K = 20). >>> > > 40000 / 200 is 200, not 20. :)
Crap, I wrote one more zero here. Actually, it is 4000K. So the factor is still 4000K/200k = 20 ;-)
-- Asias
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