linux-kernel - Re: i.MX6, PREEMPT-RT and interactive cpufreq governor

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Message-ID: <20150217083523.GA26177@linutronix.de>
Date:	Tue, 17 Feb 2015 09:35:24 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Andrey Smirnov <andrew.smirnov@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	asmirnov@...etacorp.com, panos@...etacorp.com
Subject: Re: i.MX6, PREEMPT-RT and interactive cpufreq governor

* Andrey Smirnov | 2014-06-10 11:52:05 [-0700]:

>Eventually I am hoping to disable any sorts of frequency scaling or
>power management on our system, but I am still curious to know if that
>is a known issue patches for which exist. Does anyone has any leads/suggestions?

You need to breakout of the preempt_disable() region. However having
cpufreq running will have major effect on your latency so this might not
what you want in the long term.

>Thank you,
>Andrey Smirnov

Sebastian
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