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Date: Thu, 17 Oct 2013 16:53:30 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] PPC: Timer issues with git master
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To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, qemu-devel <qemu-devel@nongnu.org>, alex@alex.org.uk, Alexander Graf <agraf@suse.de>

Il 17/10/2013 16:40, Mark Cave-Ayland ha scritto:
> 
> Hi Paolo,
> 
> I've just attempted a bisection testing HelenOS, but I'm struggling to
> get a consistent result. Even with the same binary across multiple runs
> then sometimes I see the issue with frequent timer pauses, and sometimes
> I don't which makes tracking this down very difficult.
> 
> What I do see post-timer-rework is that when it does occur, the screen
> redraws become really really slow; rectangular blocks (maybe 2 per sec
> or so?) are redrawn very slowly working their way down the screen. I
> have a feeling from memory that HelenOS does tend to hit the timer
> interrupts quite hard on PPC so could it be that the new code somehow
> blocks screen updates under high timer interrupt load?
> 
> As for the FreeBSD issue, this seems to be something different from the
> HelenOS issue and I see it even with QEMU 1.6. A quick browse around the
> git logs points me towards this as a possible suspect:
> http://git.qemu.org/?p=qemu.git;a=commit;h=a0f9fdfd98cc0571f9921a7eadd7316532e3e289.

Can you try reverting this on top of git master (and test both guests)?

Paolo