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From: Huang Rui <ray.huang@amd.com>
To: Borislav Petkov <bp@suse.de>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	"John Stultz" <john.stultz@linaro.org>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	"Fengguang Wu" <fengguang.wu@intel.com>,
	"Aaron Lu" <aaron.lu@intel.com>,
	"Suravee Suthikulanit" <suravee.suthikulpanit@amd.com>,
	"Tony Li" <tony.li@amd.com>, "Ken Xue" <ken.xue@amd.com>
Subject: Re: [PATCH v5 2/2] x86, mwaitt: introduce mwaix delay with a configurable timer
Date: Mon, 15 Jun 2015 22:33:08 +0800	[thread overview]
Message-ID: <20150615143307.GA28898@hr-slim.amd.com> (raw)
In-Reply-To: <20150615142559.GC4481@pd.tnic>

On Mon, Jun 15, 2015 at 04:25:59PM +0200, Borislav Petkov wrote:
> On Mon, Jun 15, 2015 at 10:04:19PM +0800, Huang Rui wrote:
> > Hmm, the current processor cannot enter C1 with MWAITX, so I don't
> > confirm if it would have higher wakeup latency on C1 in future.
> 
> I remember you saying MWAITX enters currently something between C1 and
> C0. How does that behave wrt latency and power savings?
> 

Yes, right. The power consumption is less than C0 (C0 > MWAITX > C1).
The waiting exit speed is faster than HTL.

Thanks,
Rui

  reply	other threads:[~2015-06-15 14:34 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-15 10:48 [PATCH v5 0/2] x86, mwaitt: introduce AMD mwaitt support Huang Rui
2015-06-15 10:48 ` [PATCH v5 1/2] x86, mwaitt: add monitorx and mwaitx instruction Huang Rui
2015-06-15 10:55   ` Peter Zijlstra
2015-06-15 12:42     ` Huang Rui
2015-06-15 10:48 ` [PATCH v5 2/2] x86, mwaitt: introduce mwaix delay with a configurable timer Huang Rui
2015-06-15 10:57   ` Peter Zijlstra
2015-06-15 11:15     ` Borislav Petkov
2015-06-15 14:04       ` Huang Rui
2015-06-15 14:25         ` Borislav Petkov
2015-06-15 14:33           ` Huang Rui [this message]
2015-06-15 14:14     ` Huang Rui

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