From: "Li,Rongqing" <lirongqing@baidu.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"tony.luck@intel.com" <tony.luck@intel.com>,
"jpoimboe@kernel.org" <jpoimboe@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: RE: [PATCH 1/2][v2] cpuidle-haltpoll: Replace default_idle with arch_cpu_idle
Date: Fri, 9 Dec 2022 13:44:39 +0000 [thread overview]
Message-ID: <18a9a8b46076468a90c3823fd2c9447e@baidu.com> (raw)
In-Reply-To: <080936167059.CAJZ5v0g5kTRE+x-8xC2WwQr11j01ox=Nk0aguiC1_HGPU8W=Rw@mail.gmail.com>
> > latency of sockperf ping-pong localhost test is reduced by more 20%
> > unixbench has 5% performance improvements for single core
> >
Sorry, The upper data are wrong since wrong governor is used
when guest has mwait, and haltpoll driver is loaded and haltpoll governor is used.
on Intel cpu, unixbench score are nearly same, but sockperf has 20% low latency
on AMD milan cpu, the sockperf latency are similar , but unixbench single core score has 10% loss, because AMD cpu maybe has weak smt capability
Replace default idle with arch cpu idle has little effect
Thanks
-Li
I
prev parent reply other threads:[~2022-12-09 13:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-07 12:41 [PATCH 1/2][v2] cpuidle-haltpoll: Replace default_idle with arch_cpu_idle lirongqing
2022-12-07 12:41 ` [PATCH 2/2][v2] cpuidle-haltpoll: Build as module by default lirongqing
2022-12-07 14:39 ` Rafael J. Wysocki
[not found] ` <080936016634.CAJZ5v0i9J2YimfQsqJiZjFMR9MLG0fdBf+Regr+_PcsYrAE=SQ@mail.gmail.com>
2022-12-08 2:32 ` Li,Rongqing
2022-12-08 11:42 ` Rafael J. Wysocki
2022-12-08 12:42 ` Li,Rongqing
2022-12-08 13:11 ` Rafael J. Wysocki
2022-12-16 15:01 ` Peter Zijlstra
2022-12-07 14:37 ` [PATCH 1/2][v2] cpuidle-haltpoll: Replace default_idle with arch_cpu_idle Rafael J. Wysocki
[not found] ` <080936167059.CAJZ5v0g5kTRE+x-8xC2WwQr11j01ox=Nk0aguiC1_HGPU8W=Rw@mail.gmail.com>
2022-12-08 1:46 ` Li,Rongqing
2022-12-08 11:39 ` Rafael J. Wysocki
2022-12-08 12:41 ` Li,Rongqing
2022-12-08 13:01 ` Rafael J. Wysocki
2022-12-09 13:44 ` Li,Rongqing [this message]
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