realtime:documentation:howto:tools:cpu_shielding
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| - | ====== 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: | ||
| - | <code bash> | ||
| - | $ /etc/init.d/irqbalance stop | ||
| - | </code> | ||
| - | To disable after next reboot do: | ||
| - | <code bash> | ||
| - | $ chkconfig irqbalance off | ||
| - | </code> | ||
| - | After this you can change the CPU affinity mask of each interrupt by doing: | ||
| - | <code bash> | ||
| - | $ echo hex_mask > /proc/irq/<irq_number>/smp_affinity | ||
| - | </code> | ||
| - | To check that the affinity mask has been set you can check the contents of the smp_affinity file. | ||
| - | <WRAP center round important 100%> | ||
| - | The mask is updated the next time an interrupt is serviced. So you may not see the change immediately. | ||
| - | </WRAP> | ||
realtime/documentation/howto/tools/cpu_shielding.1494286286.txt.gz ยท Last modified: 2017/05/08 23:31 (external edit)
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