Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device

[Stefan Hajnoczi]

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.

Stefan
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