On Thu, Jun 16, 2016 at 11:19:51AM -0400, Keith Busch wrote: > On Wed, Jun 15, 2016 at 10:50:53PM +0200, Bart Van Assche wrote: > > Does it matter on x86 systems whether or not these interrupt vectors are > > also associated with a CPU with a higher CPU number? Although multiple bits > > can be set in /proc/irq/<n>/smp_affinity only the first bit counts on x86 > > platforms. In default_cpu_mask_to_apicid_and() it is easy to see that only > > the first bit that has been set in that mask counts on x86 systems. > > Wow, thanks for the information. I didn't know the apic wasn't using > the full cpu mask, so this changes how I need to look at this, and will > experiment with such a configuration. I have vague memories of this, but you probably need to check PPC as well. Its interrupt distribution is not straightforward as well, AFAIR. -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
