From: "Li,Rongqing" <lirongqing@baidu.com>
To: Wanpeng Li <kernellwp@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
kvm <kvm@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: 答复: [PATCH] KVM: Consider SMT idle status when halt polling
Date: Thu, 22 Jul 2021 07:10:55 +0000 [thread overview]
Message-ID: <1c26ad3589f8495f9f30fdab485d353d@baidu.com> (raw)
In-Reply-To: <CANRm+Cx-5Yyxx5A4+qkYa01MG4BCdwXPd++bmxzOid+XL267cQ@mail.gmail.com>
> -----邮件原件-----
> 发件人: Wanpeng Li <kernellwp@gmail.com>
> 发送时间: 2021年7月22日 13:55
> 收件人: Li,Rongqing <lirongqing@baidu.com>
> 抄送: Paolo Bonzini <pbonzini@redhat.com>; Ingo Molnar
> <mingo@redhat.com>; Peter Zijlstra <peterz@infradead.org>; kvm
> <kvm@vger.kernel.org>; LKML <linux-kernel@vger.kernel.org>
> 主题: Re: [PATCH] KVM: Consider SMT idle status when halt polling
>
> On Thu, 22 Jul 2021 at 12:07, Li RongQing <lirongqing@baidu.com> 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
next prev parent reply other threads:[~2021-07-22 7:11 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-22 3:58 [PATCH] KVM: Consider SMT idle status when halt polling Li RongQing
2021-07-22 4:15 ` Mika Penttilä
2021-07-22 5:22 ` 答复: " Li,Rongqing
2021-07-22 5:55 ` Wanpeng Li
2021-07-22 7:10 ` Li,Rongqing [this message]
2021-07-22 12:16 ` 答复: " Li,Rongqing
2021-07-27 1:25 ` Sean Christopherson
2021-07-27 6:39 ` 答复: " Li,Rongqing
2021-07-22 13:35 ` kernel test robot
2021-07-22 14:52 ` kernel test robot
2021-07-22 15:07 ` Dongli Zhang
2021-07-22 15:20 ` Dongli Zhang
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