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    SubjectRe: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device
    I hit a weirdness yesterday, just want to mention it in case you notice it too.

    When running vanilla qemu-kvm I forgot to use aio=native. When I
    compared the results against virtio-blk-data-plane (which *always*
    uses Linux AIO) I was surprised to find average 4k read latency was
    lower and the standard deviation was also lower.

    So from now on I will run tests both with and without aio=native.
    aio=native should be faster and if I can reproduce the reverse I'll
    try to figure out why.


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      Last update: 2011-07-29 14:53    [W:0.019 / U:54.732 seconds]
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