Messages in this thread | | | Date | Wed, 28 May 2014 21:56:35 +0200 | Subject | Re: [RFC] perf/x86: PMU IRQ handler issues | From | Stephane Eranian <> |
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On Wed, May 28, 2014 at 9:55 PM, Andi Kleen <ak@linux.intel.com> 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 > -- > ak@linux.intel.com -- Speaking for myself only
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