From: Matthew Garrett <mjg59@srcf.ucam.org>
To: yakui.zhao@intel.com
Cc: lenb@kernel.org, linux-acpi@vger.kernel.org,
Venkatesh Pallipadi <venki@google.com>
Subject: Re: [PATCH] ACPI: Fix the incorrect calculation about C-state idle time
Date: Wed, 2 Jun 2010 16:06:59 +0100 [thread overview]
Message-ID: <20100602150659.GA5335@srcf.ucam.org> (raw)
In-Reply-To: <1275447849-25761-1-git-send-email-yakui.zhao@intel.com>
On Wed, Jun 02, 2010 at 11:04:09AM +0800, yakui.zhao@intel.com wrote:
> From: Zhao Yakui <yakui.zhao@intel.com>
>
> The C-state idle time is not calculated correctly, which will return the wrong
> residency time in C-state. It will have the following effects:
> 1. The system can't choose the deeper C-state when it is idle next time.
> Of course the system power is increased. E.g. On one server machine about 40W
> idle power is increased.
> 2. The powertop shows that it will stay in C0 running state about 95% time
> although the system is idle at most time.
What kind of system was this seen on?
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-06-02 15:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-02 3:04 [PATCH] ACPI: Fix the incorrect calculation about C-state idle time yakui.zhao
2010-06-02 15:06 ` Matthew Garrett [this message]
2010-06-03 1:06 ` ykzhao
2010-06-03 1:39 ` Matthew Garrett
2010-06-02 16:28 ` Venkatesh Pallipadi
2010-06-03 5:42 ` Len Brown
2010-06-02 16:29 ` Venkatesh Pallipadi
2010-06-04 7:35 ` Len Brown
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