Marcelo Tosatti wrote:
The in-kernel PIT emulation can either inject too many or too few
interrupts.
While it's an improvement, the in-kernel pit is still not perfect. For
example, on pit frequency changes the
pending count should be recalculated and matched to the new frequency. I
also tumbled on live migration problem
and there is your guest smp fix.
IMHO we need to switch back to userspace pit. [Actually I did consider
in-kernel pit myself in the past.]. The reasons:
1. There is no performance advantage doing this in the kernel.
It's just potentially reduced the host stability and reduces code
2. There are floating patches to fix pit/rtc injection in the same way
the acked irq is sone here.
So the first 2 patches are relevant.
3. Will we do the same for rtc? -> why duplicate userspace code in the
kernel?
We won't have smp issues since we have qemu_mutex and it will be
simpler too.
If you agree, please help merging the qemu patches.
Otherwise argue against the above :)
Cheers, Dor
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