userspace irq balancer
I'm interested in using this for voyager. However, I have a problem in that voyager may have CPUs that can't accept interrupts (this is global on voyager, but may be per-interrupt on NUMA like systems). I think before we move to a userspace solution, some thought about how to cope with this is needed.
I have several suggestions:
1. Place the masks into /proc/irq/<n>/smp_affinity at start of day and have the userspace irqbalancer take this as the maximal mask
2. Have a separate file /proc/irq/<n>/mask(?) to expose the mask always
3. Some other method...
Comments would be welcome
James
Quoted 6 lines · James Bottomley
I'm interested in using this for voyager. However, I have a problem in that voyager may have CPUs that can't accept interrupts (this is global on voyager, but may be per-interrupt on NUMA like systems). I think before we move to a userspace solution, some thought about how to cope with this is needed.
Quoted 8 lines
I have several suggestions:
1. Place the masks into /proc/irq/<n>/smp_affinity at start of day and have the userspace irqbalancer take this as the maximal mask
2. Have a separate file /proc/irq/<n>/mask(?) to expose the mask always
3. Some other method...
I would prefer the second method.