realtime:documentation:howto:tools:cpu_shielding
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Table of Contents
CPU shielding using /proc and /dev/cpuset
Interrupt shielding
Kernel Space
In order to shield CPUs from individual interrupts being serviced on them you have to make sure that the following kernel configuration parameter is set:
- CONFIG_IRQBALANCE
User Space
Then make sure that the interrupts are not automatically balanced by the irqbalance daemon. This daemon is started from the irqbalance init script. To disable once do:
$ /etc/init.d/irqbalance stop
To disable after next reboot do:
$ chkconfig irqbalance off
After this you can change the CPU affinity mask of each interrupt by doing:
$ echo hex_mask > /proc/irq/<irq_number>/smp_affinity
To check that the affinity mask has been set you can check the contents of the smp_affinity file.
The mask is updated the next time an interrupt is serviced. So you may not see the change immediately.
realtime/documentation/howto/tools/cpu_shielding.1494286286.txt.gz · Last modified: 2017/05/08 23:31 (external edit)
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