linux-kernel - Re: [PATCH 1/3] powernow-k6: disable cache when changing frequency

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Message-ID: <CAKohpok=exdOO-T+SFxsyqCBZ1N8ZFBMcVNn-AYsxxMw74DeJQ@mail.gmail.com>
Date:	Fri, 3 Jan 2014 11:10:58 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] powernow-k6: disable cache when changing frequency

On 2 January 2014 23:08, Mikulas Patocka <mpatocka@...hat.com> wrote:
> Flushing the cache and changing frequency takes approximatelly 500us. The
> patch increases policy->cpuinfo.transition_latency to that value.

Its not about how fast caches get cleaned but how much time would
be wasted to get them filled again as same data could be required again
which is just flushed out. That would impact performance more than
flushing caches.
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