Virtio/Block/Latency: Difference between revisions
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This page describes how virtio-blk latency can be measured. The aim is to build a picture of the latency at different layers of the virtualization stack for virtio-blk. | This page describes how virtio-blk latency can be measured. The aim is to build a picture of the latency at different layers of the virtualization stack for virtio-blk. | ||
== Benchmarks == | |||
Single-threaded read or write benchmarks are suitable for measuring virtio-blk latency. | |||
I use a simple sequential read C program which prints the average time per read operation at the end. | |||
== Instrumenting the stack == | |||
==== Guest ==== | |||
==== Guest virtio-pci ==== | |||
==== Host kvm ==== | |||
==== QEMU virtio ==== | |||
==== QEMU paio ==== | |||
==== Host pread64 ==== | |||
Revision as of 06:25, 3 June 2010
This page describes how virtio-blk latency can be measured. The aim is to build a picture of the latency at different layers of the virtualization stack for virtio-blk.
Benchmarks
Single-threaded read or write benchmarks are suitable for measuring virtio-blk latency.
I use a simple sequential read C program which prints the average time per read operation at the end.