linux-kernel - Re: [PATCH] sched: Improve latencies under load by decreasing minimum scheduling granularity

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Message-ID: <1284402534.26719.2.camel@Joe-Laptop>
Date:	Mon, 13 Sep 2010 11:28:54 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: Improve latencies under load by decreasing
 minimum scheduling granularity

On Mon, 2010-09-13 at 20:23 +0200, Ingo Molnar wrote:
>       sched: Improve latencies under load by decreasing minimum scheduling granularity
>  kernel/sched_fair.c |    6 +++---
> @@ -54,13 +54,13 @@ enum sched_tunable_scaling sysctl_sched_tunable_scaling
>   * Minimal preemption granularity for CPU-bound tasks:
>   * (default: 2 msec * (1 + ilog(ncpus)), units: nanoseconds)
>   */
> -unsigned int sysctl_sched_min_granularity = 2000000ULL;
> -unsigned int normalized_sysctl_sched_min_granularity = 2000000ULL;
> +unsigned int sysctl_sched_min_granularity = 750000ULL;
> +unsigned int normalized_sysctl_sched_min_granularity = 750000ULL;

Change the comment as well?


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