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

[Asias He]

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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