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Re: [Qemu-devel] ppc emulation and interrupts
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] ppc emulation and interrupts |
Date: |
Wed, 21 Jan 2009 21:42:29 +0200 |
On 1/21/09, Stefano Stabellini <address@hidden> wrote:
> Lennart Sorensen wrote:
>
> > 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?
>
>
>
> No, this bug prevents qemu from working when only vnc is enabled.
>
>
>
> > Even with the latest patches, sdl is still slow for ppc emulation. Not
> > using much cpu either of course.
> >
>
>
>
> I'll investigate more on this.
> As I said before, sdl shouldn't be noticeable slower now, unless you are
> using remote X.
> I have just tried debian ppc and I get similar performances using vnc
> (localhost) or sdl (local X server).
I just committed a fix, now both -nographic and VNC work for Sparc64
and VNC on PPC.