> -----邮件原件----- > 发件人: Wanpeng Li <kernellwp@xxxxxxxxx> > 发送时间: 2021年7月22日 13:55 > 收件人: Li,Rongqing <lirongqing@xxxxxxxxx> > 抄送: Paolo Bonzini <pbonzini@xxxxxxxxxx>; Ingo Molnar > <mingo@xxxxxxxxxx>; Peter Zijlstra <peterz@xxxxxxxxxxxxx>; kvm > <kvm@xxxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx> > 主题: Re: [PATCH] KVM: Consider SMT idle status when halt polling > > On Thu, 22 Jul 2021 at 12:07, Li RongQing <lirongqing@xxxxxxxxx> wrote: > > > > 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 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
