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Date: Fri, 10 Dec 2010 18:11:35 +0300 From: Cyrill Gorcunov <gorcunov@...il.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Stephane Eranian <eranian@...gle.com>, Lin Ming <ming.m.lin@...el.com>, Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>, Frederic Weisbecker <fweisbec@...il.com>, Arjan van de Ven <arjan@...radead.org>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [RFC PATCH 2/3 v3] perf: Implement Nehalem uncore pmu On Fri, Dec 10, 2010 at 11:52:15AM +0100, Peter Zijlstra wrote: > On Fri, 2010-12-10 at 11:47 +0100, Peter Zijlstra wrote: > > On Fri, 2010-12-10 at 00:46 +0100, Stephane Eranian wrote: > > > Hi, > > > > > > So I have tested this patch a bit on WSM and as I expected there > > > are issues with sampling. > > > > > > When HT is on, both siblings CPUs get the interrupt. The HW does not > > > allow you to only point interrupts to a single HT thread (CPU). > > > > Egads, how ugly :/ > > crap... ... > > That would of course need to also grow some smarts to detect if there is > only 1 sibling online. > > CC'ed Cyrill as P4 might have something similar. > Yes, Don was testing p4 stuff for me and have reported this issue as well. I'll check what I can do. Thanks for CC'ing me. Cyrill -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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