On Wed, May 28, 2014 at 9:55 PM, Andi Kleen <[email protected]> wrote: > >> Another explanation is that because we ACK the NMI early, we leave the >> door open to other interrupts, incl. NIC, and we are interrupting the >> execution > > PMI executes with interrupts off. > And that's coming from where?
>> of the PMU IRQ handler, yet that detour is measured in the PMU handler >> latency, causing more throttling than needed. Is that a plausible scenario >> too? >> And if so, I think we need to narrow the window for timing errors, by >> acking late >> on all processors and not just HSW. > > If you think there's a concrete problem please show an ftrace. > > -Andi > -- > [email protected] -- Speaking for myself only -- 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/
