Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751768AbaBETeM (ORCPT ); Wed, 5 Feb 2014 14:34:12 -0500 Received: from smtpauth05h.mfg.siteprotect.com ([64.26.60.146]:35792 "EHLO smtpauth05.mfg.siteprotect.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751175AbaBETeJ (ORCPT ); Wed, 5 Feb 2014 14:34:09 -0500 Date: Wed, 5 Feb 2014 14:37:29 -0500 (EST) From: Vince Weaver X-X-Sender: vince@pianoman.cluster.toy To: Peter Zijlstra cc: junk@eslaf.co.uk, alan@lxorguk.ukuu.org.uk, Ingo Molnar , Stephane Eranian , linux-kernel@vger.kernel.org Subject: Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6 In-Reply-To: Message-ID: References: <20140205102718.GF3229@twins.programming.kicks-ass.net> <20140205192012.GL2936@laptop.programming.kicks-ass.net> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-CTCH-Spam: Unknown X-CTCH-RefID: str=0001.0A020202.52F29230.0168,ss=1,re=0.000,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 5 Feb 2014, Vince Weaver wrote: > Has someone actually hit this bug? People used PAPI/perfctr on these > machines for years, and it uses rdpmc by default so I would think it would > show up if it were an issue. I should check the perfctr code to see if it > had some sort of check. I can verify the perfctr code does have a case for PPRO errata 26, but it only disables things on pentium pros with stepping less than 9. It also disables rdpmc on original Pentiums due to errata 74 but I don't think we have to worry about that one. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/