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Istvan
Asked: 2014-09-26 10:47:05 +0800 CST

Setting default_smp_affinity on Linux to the correct value

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I have 12 core boxes:

egrep -c processor /proc/cpuinfo
12

cat /proc/irq/default_smp_affinity
fff

I would like to use all of the cores so my understanding is that the default_smp_affinity should be set to ffffffffffff.

echo ffffffffffff > /proc/irq/default_smp_affinity
-bash: echo: write error: Value too large for defined data type

How can I make sure that all of the cores are equally used and the default_smp_affinity is set correctly?

Versions:

cat /etc/issue.net
CentOS release 6.5 (Final)

uname:

2.6.32-431.23.3.el6.x86_64 #1 SMP Thu Jul 31 17:20:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Any input is appreciated.

linux

1 Answers

  1. Actually the fff is the right setting for a 12 core box. The IRQ distribution was not sooth enough this is why I thought it might be misconfigured.

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