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[66.183.142.209]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35662e537desm7701128a91.4.2026.02.11.21.54.36 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 11 Feb 2026 21:54:37 -0800 (PST) From: "Doug Smythies" To: "'Peter Zijlstra'" , "'Vincent Guittot'" Cc: "'K Prateek Nayak'" , , , , , , , , , , , "Doug Smythies" References: <4c48fe59-8ff3-41fb-83cb-869409f6fbc6@amd.com> <20260203111134.GL1282955@noisy.programming.kicks-ass.net> <38ef3462-4c4e-4f40-8d63-84dd71cbd043@amd.com> <20260209154718.GW1282955@noisy.programming.kicks-ass.net> <002501dc9b16$442a7050$cc7f50f0$@telus.net> <20260211090144.GY1282955@noisy.programming.kicks-ass.net> <20260211104833.GH1395416@noisy.programming.kicks-ass.net> <20260211162149.GJ1395416@noisy.programming.kicks-ass.net> In-Reply-To: <20260211162149.GJ1395416@noisy.programming.kicks-ass.net> Subject: RE: [PATCH 0/4] sched: Various reweight_entity() fixes Date: Wed, 11 Feb 2026 21:54:40 -0800 Message-ID: <005201dc9be4$14834bf0$3d89e3d0$@telus.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: en-ca Thread-Index: AQGWA92PN6oA7k6/e4iK5biGWKgYXAJQRyxeAeZO90IBHLFUQAJXJzoWAxZi5vMBrlts4wJSvg4eAOQNBYMCbZ17MwEqkJwbtXHM1nA= On 2026.02.11 08:22 Peter Zijlstra wrote: > On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote: > >> Now let me go check on that latency thing from Doug (although hopefully >> that was the same boo-boo). > > Only ~3 hours so far, I'll let it run overnight. > > So on my ADL with P-cores only (unplug the E things): > > $ NR=`grep -c processor /proc/cpuinfo`; for ((i=0; i<$NR; i++)) do yes > /dev/null & done > $ turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out /dev/shm/turbo.log > > $ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000, bucket[i] }}' < /dev/shm/turbo.log > 1.000: 4943 > 1.001: 5000 > 1.002: 21 > 1.003: 10 > 1.004: 1 > 1.005: 1 > > Which seems to suggest things are looking better again. Same here, 6 hours and 20 minutes so far, and I'll leave it overnight: By the way, thank you for the cool parsing and histogram command line. $ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000, bucket[i] }}' < /dev/shm/turbo.log 1.000: 12381 1.001: 10388 1.002: 32 1.003: 20 1.004: 9 1.005: 2 1.006: 2 System: Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs. CPU frequency scaling driver: intel_pstate. CPU frequency scaling governor: powersave. HWP: enabled. idle governor teo.