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Date: Mon, 25 May 2015 12:43:48 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Huang Rui <ray.huang@amd.com>
Cc: Borislav Petkov <bp@suse.de>, Len Brown <lenb@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Thomas Gleixner <tglx@linutronix.de>,
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        Fengguang Wu <fengguang.wu@intel.com>, Aaron Lu <aaron.lu@intel.com>,
        "Li, Tony" <Tony.Li@amd.com>, Andy Lutomirski <luto@amacapital.net>
Subject: Re: [RFC PATCH 2/4] x86, mwaitt: introduce mwaitx idle with a
 configurable timer
Message-ID: <20150525104348.GA30252@gmail.com>
References: <1432022472-2224-1-git-send-email-ray.huang@amd.com>
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* Huang Rui <ray.huang@amd.com> wrote:

> No, the timeout value doesn't decide how 'deep' the power state 
> enters. Basically, the same power consumption with any timeout.
> 
> I summarized the comparison of mwait and mwaitx
> 
>                 MWAIT                           MWAITX
> opcode          0f 01 c9           |            0f 01 fb
> ECX[0]                  value of RFLAGS.IF seen by instruction
> ECX[1]          unused/#GP if set  |            enable timer if set
> ECX[31:2]                     unused/#GP if set
> EAX                             unused
> EBX[31:0]       unused             |            max wait time (loops)
> 
> 
>                 MONITOR                         MONITORX
> opcode          0f 01 c8           |            0f 01 fa
> EAX                     (logical) address to monitor
> ECX                     #GP if not zero

Ok, thanks for the clarification!

Thanks,

	Ingo