Isolating a CPU From Sprayed Interrupts

Isolating a CPU From Sprayed Interrupts

By default, the Challenge/Onyx hardware directs I/O interrupts from the VME bus to CPUs in rotation (called spraying interrupts). You do not want a real-time process interrupted at unpredictable times to handle I/O. The system administrator can isolate one or more CPUs from sprayed interrupts by placing the NOINTR statement in the configuration file /var/sysgen/system/irix.sm. The syntax is

NOINTR cpu# [cpu#]...

After modifying irix.sm, rebuild the kernel using the command /etc/autoconfig -vf.