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Subject: Re: [BENCHMARK] scheduler tunables with contest - prio_bonus_ratio
From: Robert Love <rml@tech9.net>
To: Con Kolivas <conman@kolivas.net>
Cc: Andrew Morton <akpm@digeo.com>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
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On Thu, 2002-12-19 at 18:42, Con Kolivas wrote:

> I guess this explains why my variable timeslice thingy in -ck helps on the 
> desktop. Basically by shortening the timeslice it is masking the effect of 
> the interactivity estimator under load. That is, it is treating the symptoms 
> of having an interactivity estimator rather than tackling the cause.

You would probably get the same effect or better by setting
prio_bonus_ratio lower (or off).

Setting it lower will also give less priority bonus/penalty and not
reinsert the tasks so readily into the active array.

Something like the attached patch may help...

	Robert Love

--- linux-2.5.52/kernel/sched.c	2002-12-19 18:47:53.000000000 -0500
+++ linux/kernel/sched.c	2002-12-19 18:48:05.000000000 -0500
@@ -66,8 +66,8 @@
 int child_penalty = 95;
 int parent_penalty = 100;
 int exit_weight = 3;
-int prio_bonus_ratio = 25;
-int interactive_delta = 2;
+int prio_bonus_ratio = 5;
+int interactive_delta = 1;
 int max_sleep_avg = 2 * HZ;
 int starvation_limit = 2 * HZ;
 



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