Subject: Re: [PATCH 3/3] cpuidle,menu: smooth out measured_us calculation
To: riel@redhat.com, linux-pm@vger.kernel.org
References: <1446590059-18897-1-git-send-email-riel@redhat.com>
 <1446590059-18897-4-git-send-email-riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
        len.brown@intel.com, daniel.lezcano@linaro.org
From: Arjan van de Ven <arjan@linux.intel.com>
Message-ID: <563A2C21.8020308@linux.intel.com>
Date: Wed, 4 Nov 2015 08:02:41 -0800
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.3.0
MIME-Version: 1.0
In-Reply-To: <1446590059-18897-4-git-send-email-riel@redhat.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 728
Lines: 17

On 11/3/2015 2:34 PM, riel@redhat.com wrote:

> Furthermore, for smaller sleep intervals, we know the chance that
> all the cores in the package went to the same idle state are fairly
> small. Dividing the measured_us by two, instead of subtracting the
> full exit latency when hitting a small measured_us, will reduce the
> error.

there is no perfect answer for this issue; but at least this makes the situation
a lot better, so

Acked-by: Arjan van de Ven <arjan@linux.intel.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/