Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk

On 07/03/2012 09:31 PM, Paolo Bonzini wrote:

Il 02/07/2012 08:41, Rusty Russell ha scritto:

quoted

quoted

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