[Qemu-devel] Re: [kvm-devel] [PATCH] report revision 3 of the ACPI/SMBus PIIX4 controller

[Avi Kivity]

Marcelo Tosatti wrote:
> The PIIX4 ACPI controller prior to revision 0x3 contains a bug where
> reading of the timer port is unreliable, so the kernel reads it three
> times for consistency check.
>
> QEMU does not suffer from that problem :)
>
> The datasheet for PIIX4, PIIX4E, and PIIX4M is the same. I failed to
> find any indication that the revision increase could affect anything
> other than the PMTimer port read.
>
> This reduces idle guest CPU consumption from 14% to 8% on 4-way KVM
> guest.
>
>   

Applied (to kvm's qemu), thanks.

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