How virtio-blk latency can be measured

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hi,I want to calculate the latencyof virtio in kvm, I read the document
in http://www.linux-kvm.org/page/Virtio/Block/Latency and met some
problem.
1. when calculating latency in kvm, the document said  kvm_pio and
kvm_set_irq can be filtered using command 'lspci -vv -nn' and
'cat /proc/interrupts' , but I don't know how to use the result to
filter kvm_pio and kvm_set_irq.
2. Anyone know who is the author of this webpage:
http://www.linux-kvm.org/page/Virtio/Block/Latency .
Thank you.

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