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    SubjectRe: [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:
    >>> 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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