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

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

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. :)

Paolo

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