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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