Re: [Qemu-devel] Block I/O outside the QEMU global mutex was "Re: [RFC PATCH 00/17] Support for multiple "AIO contexts""

[Stefan Hajnoczi]

On Tue, Oct 9, 2012 at 2:01 PM, Paolo Bonzini <address@hidden> wrote:
> Il 09/10/2012 13:55, Avi Kivity ha scritto:
>> Oh, agree 100% raw + native aio wants to bypass coroutines/threads
>> completely.
>
> Even posix-aio-compat can bypass coroutines.

Yes.  I'll send benchmarks to show how much overhead there is from the
block layer coroutines.

The reason I'm interested in the aio fastpath is because Asias
benchmarked lkvm vs qemu-kvm and found that QEMU's average latency and
variance are much higher.

Stefan