Messages in this thread | | | Subject | Re: CONFIG_IRQBALANCE for 64-bit x86 ? | From | Andi Kleen <> | Date | Tue, 20 Nov 2007 20:17:57 +0100 |
| |
Nick Piggin <nickpiggin@yahoo.com.au> writes: > > For that matter, I'd like to know why it has been decided that the > best place for IRQ balancing is in userspace.
There is a lot of possible policy in it
> It should be in kernel > IMO, and it would probably allow better power saving, performance, > fairness, etc. if it were to be integrated with the task balancer as > well.
Integrating with the task balancer makes really only sense if the device supports MSI-X and if it does that you don't really need an irq balancer because you can just send to all CPUs as needed.
Without MSI-X you would be trying to reprogram the interrupts all the time when a task is migrating and it is highly doubtful that doing that automatically would do any good.
-Andi
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |