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

Anders
2008-04-16T10:26:10Z

Avi Kivity wrote:

> if select() doesn't enable signals (like you can do with pselect) you
> may sit for a long time in select() until the timer expires.

Hm. Does the guest timer affect host userspace in all configurations? The
original trigger for my SIGIO patch was that opening a VNC connection
would take up to a second, until the qemu RTC timer fired.

> Consider a 100Hz Linux guest running 'ls -lR' out of a cold cache:
> instead of 1-2 ms disk latencies you'll see 10 ms latencies, killing
> performance by a factor of 5.

I guess this works out even worse for a dyntick guest?

> I still think (1) should be merged, preferably to qemu upstream.

I will give it another try. They are not very receptive, though, and I am
not that confident in what the patch is actually doing :-). You guys are
helping me a lot in that regard, thanks.

Cheers,
Anders.