linux-kernel - Re: [PATCH] cpufreq: Governor poll frequency tuneables exported in config.

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Message-ID: <49996B42.5040500@tremplin-utc.net>
Date:	Mon, 16 Feb 2009 14:33:54 +0100
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Mike Chan <mike@...roid.com>
Cc:	davej@...emonkey.org.uk, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org
Subject: Re: [PATCH] cpufreq: Governor poll frequency tuneables exported in
 config.

Mike Chan schreef:
>     cpufreq: Governor poll frequency tuneables exported in config.
>     
Hello,

> +config CPU_FREQ_MIN_TICKS
> +	int "Ticks between governor polling interval."
> +	default 10
> +	help
> +	  Minimum number of ticks between polling interval for governors.
I don't think it makes much sense to let anyone tune this parameter.
This is a constant that says we need at least a 10% granularity to
compute any statistic correctly. There is nothing much to be discussed
or tuned.


> +config CPU_FREQ_SAMPLING_LATENCY_MULTIPLIER
> +	int "Sampling rate multiplier for governors."
> +	default 1000
> +	help
> +	  Sampling latency rate multiplied by the cpu switch latency.
> +	  Affects governor polling.
This one, why not (although I don't think it's worth neither), and it
would need a better documentation.

Eric

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