On 9/12/07, Venkat Subbiah <[EMAIL PROTECTED]> wrote: > Most of the load in my system is triggered by a single ethernet IRQ. > Essentially the IRQ schedules a tasklet and most of the work is done in the > taskelet which is scheduled in the IRQ. From what I read looks like the > tasklet would be executed on the same CPU on which it was scheduled. So this > means even in an SMP system it will be one processor which is overloaded. > > So will using the user space IRQ loadbalancer really help? What I am doubtful > about is that the user space load balance comes along and changes the > affinity once in a while. But really what I need is every interrupt to go to > a different CPU in a round robin fashion. > > Looks like the APIC can distribute IRQ's dynamically? Is this supported in > the kernel and any config or proc interface to turn this on/off. >
/proc/irq/<irq#>/smp_affinity. But this is not generally suggested for performance reasons (cache issues etc). > > Thx, > Venkat > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
