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Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm |
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Date: |
Wed, 07 Mar 2012 12:21:45 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 07/03/2012 11:39, Martin Mailand ha scritto:
> The host disk can at max. 13K iops, in qemu I get at max 6,5K iops,
> that's around about 50% overhead. All the test were with 4k reads, so I
> think we are mostly latency bound.
For latency tests, running without ioeventfd could give slightly better
results (-global virtio-blk-pci.ioeventfd=off).
Paolo
Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Dongsu Park, 2012/03/06