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

Avi Kivity
2008-04-15T05:40:58Z

Marcelo Tosatti wrote:
> On Mon, Apr 14, 2008 at 07:24:06PM +0300, Avi Kivity wrote:
>
>>> Issue is that the dumb console timer "wakes up" the vcpu to do IO
>>> processing in main_loop_wait().
>>>
>>> So while you're right that vga_hw_update() is a no-op for the -nographic
>>> case, the indirect effect of the timer triggering main_loop_wait() is
>>> needed for reading input from stdio in a way that feels interactive for
>>> the user.
>>>
>>>
>>>
>> Why not enable SIGIO on stdio input, like the rest of the fd handling in
>> qemu?
>>
>
> Thats a possibility, but I think we've now agreed that doing select() with a
> timeout is cleaner and possibly half a cent faster.
>
>

Yes, just wanted to make sure I don't miss something.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.