linux-kernel - 2.6.22+, CONFIG_NO_HZ=n, but irq/s looks like NO

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Message-ID: <4728DF7E.9090606@rqdq.com>
Date:	Wed, 31 Oct 2007 16:03:10 -0400
From:	Benjamin Yates <benjamin@...q.com>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.22+, CONFIG_NO_HZ=n, but irq/s looks like NO_HZ=y


    can't find many references on this one, so posting here...

    CONFIG_NO_HZ=n, but vmstat output shows int/sec which looks like a 
dynticks setup.

    vmstat lies?

    vmstat needs an update?

    -benjamin

   

root@...hblah /usr/src/linux # uname -a
Linux blahblah 2.6.23.1 #2 SMP Sun Oct 14 23:40:05 EDT 2007 i686 Dual 
Core AMD Opteron(tm) Processor 185 AuthenticAMD GNU/Linux

root@...hblah /usr/src/linux # zcat /proc/config.gz | grep HZ
# CONFIG_NO_HZ is not set
CONFIG_HZ_100=y
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=100

root@...hblah /usr/src/linux # vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- 
----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy 
id wa
 3  0      0 265492  85576 105432    0    0    45   153   26  230 24 28 
47  1
 0  0      0 265480  85576 105432    0    0     0     0    6   52  0  0 
100  0
 0  0      0 264976  85576 105432    0    0     0     0    9   65  1  3 
96  0
 0  0      0 265876  85576 105432    0    0     0     0   10   65  1  2 
97  0

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