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Subject答复: [PATCH] KVM: Consider SMT idle status when halt polling
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> > > SMT siblings share caches and other hardware, halt polling will
> > > degrade its sibling performance if its sibling is busy
> >
> > Do you have any real scenario benefits? As the polling nature, some
> > cloud providers will configure to their preferred balance of cpu usage
> > and performance, and other cloud providers for their NFV scenarios
> > which are more sensitive to latency are vCPU and pCPU 1:1 pin,you
> > destroy these setups.
> >
> > Wanpeng
>


Run a copy (single thread) Unixbench, with or without a busy poll program in its SMT sibling, and Unixbench score can lower 1/3 with SMT busy polling program

Can this case show this issue?

-Li


> True, it benefits for our real scenario.
>
> this patch can lower our workload compute latency in our multiple cores VM
> which vCPU and pCPU is 1:1 pin, and the workload with lots of computation and
> networking packets.
>
> -Li
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