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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id 13sm30086940wmf.23.2019.04.27.07.21.38 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 27 Apr 2019 07:21:39 -0700 (PDT) Date: Sat, 27 Apr 2019 16:21:37 +0200 From: Ingo Molnar To: Aubrey Li Cc: Julien Desfossez , Vineeth Remanan Pillai , Nishanth Aravamudan , Peter Zijlstra , Tim Chen , Thomas Gleixner , Paul Turner , Linus Torvalds , Linux List Kernel Mailing , Subhra Mazumdar , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Kees Cook , Greg Kerr , Phil Auld , Aaron Lu , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini Subject: Re: [RFC PATCH v2 00/17] Core scheduling v2 Message-ID: <20190427142137.GA72051@gmail.com> References: <20190424140013.GA14594@sinkpad> <20190425095508.GA8387@gmail.com> <20190427091716.GC99668@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 * Aubrey Li wrote: > On Sat, Apr 27, 2019 at 5:17 PM Ingo Molnar wrote: > > > > > > * Aubrey Li wrote: > > > > > I have the same environment setup above, for nosmt cases, I used > > > /sys interface Thomas mentioned, below is the result: > > > > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 1/1 1.987( 1.97%) 2.043( 1.76%) -2.84% 1.985( 1.70%) 0.12% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 2/2 2.074( 1.16%) 2.057( 2.09%) 0.81% 2.072( 0.77%) 0.10% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 4/4 2.140( 0.00%) 2.138( 0.49%) 0.09% 2.137( 0.89%) 0.12% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 8/8 2.140( 0.00%) 2.144( 0.53%) -0.17% 2.140( 0.00%) 0.00% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 16/16 2.361( 2.99%) 2.369( 2.65%) -0.30% 2.406( 2.53%) -1.87% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 32/32 5.032( 8.68%) 3.485( 0.49%) 30.76% 6.002(27.21%) -19.27% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 64/64 7.577(34.35%) 3.972(23.18%) 47.57% 18.235(14.14%) -140.68% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 128/128 24.639(14.28%) 27.440( 8.24%) -11.37% 34.746( 6.92%) -41.02% > > > NA/AVX baseline(std%) coresched(std%) +/- nosmt(std%) +/- > > > 256/256 38.797( 8.59%) 44.067(16.20%) -13.58% 42.536( 7.57%) -9.64% > > > > What do these numbers mean? Are these latencies, i.e. lower is better? > > Yeah, like above setup, I run sysbench(Non-AVX task, NA) and gemmbench > (AVX512 task, AVX) in different level utilizatoin. The machine has 104 CPUs, so > nosmt has 52 CPUs. These numbers are 95th percentile latency of sysbench, > lower is better. But what we are really interested in are throughput numbers under these three kernel variants, right? Thanks, Ingo