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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id z140sm7296832wmc.27.2019.04.19.01.40.29 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 19 Apr 2019 01:40:30 -0700 (PDT) Date: Fri, 19 Apr 2019 10:40:27 +0200 From: Ingo Molnar To: Subhra Mazumdar Cc: Julien Desfossez , Peter Zijlstra , tglx@linutronix.de, pjt@google.com, tim.c.chen@linux.intel.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com, Vineeth Pillai , Nishanth Aravamudan , Aaron Lu Subject: Re: [RFC][PATCH 13/16] sched: Add core wide task selection and scheduling. Message-ID: <20190419084027.GA16074@gmail.com> References: <20190218173514.667598558@infradead.org> <1554835135-11814-1-git-send-email-jdesfossez@digitalocean.com> <3514bb97-33bc-3a14-3f15-767682b2f035@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <3514bb97-33bc-3a14-3f15-767682b2f035@oracle.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Subhra Mazumdar wrote: > I see similar improvement with this patch as removing the condition I > earlier mentioned. So that's not needed. I also included the patch for the > priority fix. For 2 DB instances, HT disabling stands at -22% for 32 users > (from earlier emails). > > > 1 DB instance > > users  baseline   %idle    core_sched %idle > 16     1          84       -4.9% 84 > 24     1          76       -6.7% 75 > 32     1          69       -2.4% 69 > > 2 DB instance > > users  baseline   %idle    core_sched %idle > 16     1          66       -19.5% 69 > 24     1          54       -9.8% 57 > 32     1          42       -27.2%        48 So HT disabling slows down the 2DB instance by -22%, while core-sched slows it down by -27.2%? Would it be possible to see all the results in two larger tables (1 DB instance and 2 DB instance) so that we can compare the performance of the 3 kernel variants with each other: - "vanilla +HT": Hyperthreading enabled, vanilla scheduler - "vanilla -HT": Hyperthreading disabled, vanilla scheduler - "core_sched": Hyperthreading enabled, core-scheduling enabled ? Thanks, Ingo