[PATCH 0/5] KVM: arm64: Accelerate lookup of vcpus by MPIDR values

[Marc Zyngier]

On Thu, 07 Sep 2023 21:27:12 +0100,
Joey Gouly <joey.gouly at arm.com> wrote:
> 
> On Thu, Sep 07, 2023 at 07:17:03PM +0100, Marc Zyngier wrote:
> > On Thu, 07 Sep 2023 16:30:52 +0100,
> > Joey Gouly <joey.gouly at arm.com> wrote:
> > 
> > [...]
> > 
> > > Got a roughly similar perf improvement (about 28%).
> > 
> > Out of curiosity, on which HW?
> 
> I used QEMU emulation, but was told after posting this that QEMU is probably
> not good to be used for perf measurments? Sorry about that. I can retry on Juno
> tomorrow if that's of any use.

Indeed, using models for performance measurement is pretty unreliable,
and will give you a rather different profile from the HW.

Unfortunately, Juno has only a GICv2, which won't see any significant
gain. You'll need something with a GICv3, as the whole interrupt
routing (SGI and SPI) is MPIDR based.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.