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Rao" , Ravi Bangoria , Stephane Eranian , Thomas Gleixner , LKML , "lkp@lists.01.org" , "Huang, Ying" Subject: RE: [LKP] Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process_ops -5.5% regression Thread-Topic: [LKP] Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process_ops -5.5% regression Thread-Index: AQHV6X3LhetjX3VofUmXB9MXuNVibagnce9U Date: Sat, 22 Feb 2020 17:08:20 +0000 Message-ID: References: <20200205123216.GO12867@shao2-debian> <20200205125804.GM14879@hirez.programming.kicks-ass.net> <20200221080325.GA67807@shbuild999.sh.intel.com> ,<20200222124359.GA86836@shbuild999.sh.intel.com> In-Reply-To: <20200222124359.GA86836@shbuild999.sh.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.3.86.139] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >Thanks for the suggestion, I tried this and the 5.5 regrssion is gone! >which also confirms the offset for the bulk of stuff following "pmu" >causes the performance drop. Okay that confirms that it is false sharing. Looking at c2c is the right way to go then. Peter, could adopt the padding as a workaround for now? -Andi