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Re: [Qemu-devel] [PATCH] icount: disable icount with multiprocessor gues
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH] icount: disable icount with multiprocessor guests |
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Date: |
Wed, 25 Sep 2013 08:39:10 +0900 |
On 25 September 2013 00:52, Paolo Bonzini <address@hidden> wrote:
> If -icount is enabled with multiprocessor guests, all CPUs increment
> the same counter, which then basically runs too fast by a factor of
> smp_cpus. This makes little sense and complicates further a feature
> whose implementation is pretty obscure already.
Just forbidding -icount with SMP configs seems like the wrong
fix, though -- why wouldn't you want the deterministic execution
icount (claims it) gives you with an SMP config?
-- PMM