[PATCH] adjust timeslice granularity

[PATCH] adjust timeslice granularity

[Con Kolivas]

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adjust timeslice granularity



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The minimum timeslice was decreased from 10ms to 5ms. In the process, the
timeslice granularity was leading to much more rapid round robinning of
interactive tasks at cache trashing levels.

Restore minimum granularity to 10ms.

Signed-off-by: Con Kolivas <kernel@kolivas.org>

Index: linux-2.6.10-rc1-mm2/kernel/sched.c
===================================================================
--- linux-2.6.10-rc1-mm2.orig/kernel/sched.c	2004-11-02 13:51:39.000000000 +1100
+++ linux-2.6.10-rc1-mm2/kernel/sched.c	2004-11-02 14:19:32.973509317 +1100
@@ -133,12 +133,14 @@
 	(NS_TO_JIFFIES((p)->sleep_avg) * MAX_BONUS / \
 		MAX_SLEEP_AVG)
 
+#define GRANULARITY	(10 * HZ / 1000 ? : 1)
+
 #ifdef CONFIG_SMP
-#define TIMESLICE_GRANULARITY(p)	(MIN_TIMESLICE * \
+#define TIMESLICE_GRANULARITY(p)	(GRANULARITY * \
 		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)) * \
 			num_online_cpus())
 #else
-#define TIMESLICE_GRANULARITY(p)	(MIN_TIMESLICE * \
+#define TIMESLICE_GRANULARITY(p)	(GRANULARITY * \
 		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)))
 #endif
 


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Re: [PATCH] adjust timeslice granularity

[Ingo Molnar]

* Con Kolivas <kernel@kolivas.org> wrote:

> adjust timeslice granularity

this too is of the 'could potentially hurt interactivity' type and needs
-mm exposure and is 2.6.11 material at the earliest. Looks good and
sound otherwise.

	Ingo