Re: [patch 2/2] QEMU: decrease console "refresh rate" with -nographic

Avi Kivity
2008-04-17T12:53:28Z

Carsten Otte wrote:
> Anthony Liguori wrote:
>> There is a 5th option. Do away with the use of posix aio. We get
>> absolutely no benefit from it because it's limited to a single
>> thread. Fabrice has reverted a patch to change that in the past.
> How about using linux aio for it? It seems much better, because it
> doesn't use userspace threads but has a direct in-kernel
> implementation. I've had good performance on zldisk with that, and
> it's stable.

Linux-aio is nice except that you can't easily complete network and disk
requests simulateneously (no IO_CMD_POLL yet). This means you need an
additional thread.

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