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From af32aa45fa28560dcef7bbee804ce11e4d70a1f7 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Fri, 4 Oct 2013 22:06:16 -0400
Subject: [PATCH 3/7] hz-no_default_250
Make 250HZ not be the default to discourage desktop users from choosing this
option since 1000 will provide better latencies with only miniscule amounts
of extra overhead and power consumption.
-ck
---
kernel/Kconfig.hz | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz
index 94fabd5..b136411 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -23,13 +23,14 @@ choice
with lots of processors that may show reduced performance if
too many timer interrupts are occurring.
- config HZ_250
+ config HZ_250_NODEFAULT
bool "250 HZ"
help
- 250 Hz is a good compromise choice allowing server performance
- while also showing good interactive responsiveness even
- on SMP and NUMA systems. If you are going to be using NTSC video
- or multimedia, selected 300Hz instead.
+ 250 HZ is a lousy compromise choice allowing server interactivity
+ while also showing desktop throughput and no extra power saving on
+ laptops. No good for anything.
+
+ Recommend 100 or 1000 instead.
config HZ_300
bool "300 HZ"
@@ -43,14 +44,16 @@ choice
bool "1000 HZ"
help
1000 Hz is the preferred choice for desktop systems and other
- systems requiring fast interactive responses to events.
+ systems requiring fast interactive responses to events. Laptops
+ can also benefit from this choice without sacrificing battery life
+ if dynticks is also enabled.
endchoice
config HZ
int
default 100 if HZ_100
- default 250 if HZ_250
+ default 250 if HZ_250_NODEFAULT
default 300 if HZ_300
default 1000 if HZ_1000
--
1.8.1.2
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