Re: [Qemu-devel] ppc emulation and interrupts

[Lennart Sorensen]

On Wed, Jan 21, 2009 at 11:49:10AM +0000, Stefano Stabellini wrote:
> Hi all,
> one of the recent problems, noticed after the displaystate change,
> affects ppc emulation only and is due to the fact that none on ppc
> emulation is issuing any interrupt request of the CPU_INTERRUPT_EXIT
> kind if the gui timer is disabled.
> Hence qemu never leaves the loop in cpu-exec.c:cpu_exec.
> If the gui timer is enabled qemu is able to leave the loop because the
> condition (interrupt_request & CPU_INTERRUPT_EXIT) is true when the
> timer is triggered.
> I think this is a problem with the ppc emulation but if you ppc guys
> need the gui timer to be always on, I can arrange for it to be.
> Regards,

So does this explain why vnc runs fast and sdl runs slow?

Even with the latest patches, sdl is still slow for ppc emulation.  Not
using much cpu either of course.

-- 
Len Sorensen