Re: [Qemu-devel] [5636] Run timers from host alarm timer callback

[Paul Brook]

On Friday 07 November 2008, Anthony Liguori wrote:
> Luis Pureza wrote:
> > Hi,
> >
> > This commit caused a noticeable slowdown while using the instruction
> > counting mechanism. I'm testing with the sparc-test image and with
> > --icount auto.
>
> Yeah, I take it that all timers don't result in signals when using
> icount and that we rely on select() timeout instead.  Let me look a
> little more closely at the code and I'll come up with a fix.

In icount mode vm_clock timers don't use host timers at all.

Instead we calculate how long we want to wait before checking again (the 
EXCP_HALT code in vl.c:main_loop), and use that as the select timeout.

Paul