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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BL6PEPF0002256E.mail.protection.outlook.com (10.167.249.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.139.8 via Frontend Transport; Tue, 16 Jun 2026 07:44:01 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Tue, 16 Jun 2026 02:44:00 -0500 Received: from [10.136.46.240] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Tue, 16 Jun 2026 02:43:57 -0500 Message-ID: <83e869c0-576f-40c1-b738-c17a82fb4c7b@amd.com> Date: Tue, 16 Jun 2026 13:13:56 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6 v2] sched/eevdf: Improve scheduling latency of short slice task To: Vincent Guittot , , , , , , , , , , References: <20260615162420.420957-1-vincent.guittot@linaro.org> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20260615162420.420957-1-vincent.guittot@linaro.org> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: hedGU4u6Dz16ZI5OirFXHAE+9W650neQV9BezV8pdg0NgISBXoQ3znsXhR7xlzB07W+8p803MMR4rUSg5e8g8ow4ial396zZwR5TJ1Td2KVpn5k9Sl6nu/Cl+K4ipxP/50bERyzrjQjaUfHDF6SuMljbugPy6xRvA0mcBBGzTRHYAsA2wbSkhkS4yFaAnW0jRQ7WYYc6GjumRdta9PVO1e4zPyjhK+l+hweeg3X0QXDcO/DfMOt8059xAPJS1ERM/lB80sFKe0flS/qX6CQUPdZ0+SPZeBEMY2/pBiUlw94595cIaV/yt1ja1ocSHRJz0fMXcxhS+lKQhS4bSIcX3/jQersYO5IGtBapO1tlfBiTnJg/A/B5DDqWlz447WP6hMcH2Z00WtDeBf9RdhZ5PjZn8V4PgfhqGOICcelvTf+HJfzkX7Y4gjeY6ae/mXxU X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jun 2026 07:44:01.6702 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f774ba6a-e34d-4a04-2433-08decb7b087f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0002256E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SAWPR12MB999164 Hello Vincent, On 6/15/2026 9:54 PM, Vincent Guittot wrote: > This series continues to improve the scheduling latency of tasks with > shorter slice duration by mainly canceling, updating or minimizing the > protection of the running tasks when appropriate. > > Benchmarks, like hackbench, haven't seen any noticeable performance > differences with this patchset (The default 2.8ms slice has been used for > testing performance regressions) I've left a few comments on the thread but for the vanilla runs, I too can confirm there aren't any without any slice tuning. Following are results from a dual socket 4th Generation EPYC system (2 x 128C/256T) with the series applied on top of "sched-core-2026-06-14": ================================================================== Test : hackbench Units : Normalized time in seconds Interpretation: Lower is better Statistic : AMean ================================================================== Case: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1-groups 1.00 [ -0.00]( 9.66) 0.86 [ 14.32](14.00) 2-groups 1.00 [ -0.00]( 9.22) 1.02 [ -1.78](10.45) 4-groups 1.00 [ -0.00]( 2.14) 0.98 [ 2.33]( 1.99) 8-groups 1.00 [ -0.00]( 2.80) 0.97 [ 2.88]( 2.93) 16-groups 1.00 [ -0.00]( 5.54) 1.00 [ 0.49]( 2.58) ================================================================== Test : tbench Units : Normalized throughput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1 1.00 [ 0.00]( 0.03) 1.00 [ 0.36]( 0.20) 2 1.00 [ 0.00]( 0.32) 1.00 [ 0.09]( 0.14) 4 1.00 [ 0.00]( 0.34) 1.00 [ 0.39]( 0.28) 8 1.00 [ 0.00]( 0.24) 1.00 [ 0.01]( 0.24) 16 1.00 [ 0.00]( 0.45) 1.00 [ 0.01]( 0.47) 32 1.00 [ 0.00]( 0.58) 1.01 [ 0.75]( 0.30) 64 1.00 [ 0.00]( 0.81) 1.02 [ 1.62]( 0.62) 128 1.00 [ 0.00]( 0.53) 1.03 [ 3.24]( 0.25) 256 1.00 [ 0.00]( 0.30) 1.00 [ 0.39]( 0.26) 512 1.00 [ 0.00]( 3.73) 1.01 [ 1.47]( 1.13) 1024 1.00 [ 0.00]( 0.23) 1.00 [ -0.10]( 0.37) 2048 1.00 [ 0.00]( 0.14) 1.00 [ 0.29]( 0.19) ================================================================== Test : stream-10 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: tip[pct imp](CV) preempt_short_opt[pct imp](CV) Copy 1.00 [ 0.00]( 0.66) 0.99 [ -0.70]( 1.66) Scale 1.00 [ 0.00]( 0.89) 0.99 [ -0.77]( 1.52) Add 1.00 [ 0.00]( 0.73) 1.00 [ -0.34]( 1.31) Triad 1.00 [ 0.00]( 0.70) 0.99 [ -0.52]( 1.24) ================================================================== Test : stream-100 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: tip[pct imp](CV) preempt_short_opt[pct imp](CV) Copy 1.00 [ 0.00]( 0.32) 1.00 [ 0.07]( 0.36) Scale 1.00 [ 0.00]( 0.26) 1.00 [ -0.00]( 0.45) Add 1.00 [ 0.00]( 0.29) 1.00 [ -0.05]( 0.39) Triad 1.00 [ 0.00]( 0.27) 1.00 [ -0.05]( 0.37) ================================================================== Test : netperf Units : Normalized Througput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1-clients 1.00 [ 0.00]( 0.10) 1.00 [ 0.02]( 0.19) 2-clients 1.00 [ 0.00]( 0.29) 1.00 [ 0.02]( 0.18) 4-clients 1.00 [ 0.00]( 0.36) 1.00 [ -0.01]( 0.23) 8-clients 1.00 [ 0.00]( 0.32) 1.00 [ 0.04]( 0.22) 16-clients 1.00 [ 0.00]( 0.24) 1.00 [ 0.09]( 0.22) 32-clients 1.00 [ 0.00]( 0.42) 1.00 [ 0.30]( 0.33) 64-clients 1.00 [ 0.00]( 0.94) 1.00 [ 0.48]( 0.67) 128-clients 1.00 [ 0.00]( 1.10) 1.01 [ 0.77]( 1.31) 256-clients 1.00 [ 0.00]( 1.06) 1.02 [ 2.02]( 1.18) 512-clients 1.00 [ 0.00]( 4.68) 0.99 [ -1.14]( 5.63) 768-clients 1.00 [ 0.00](34.35) 0.99 [ -1.00](34.84) 1024-clients 1.00 [ 0.00](42.76) 0.99 [ -0.81](45.77) ================================================================== Test : schbench Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1 1.00 [ -0.00](18.94) 0.39 [ 61.36]( 5.88) 2 1.00 [ -0.00]( 1.67) 0.91 [ 8.57]( 6.64) 4 1.00 [ -0.00]( 9.79) 0.84 [ 16.22]( 7.78) 8 1.00 [ -0.00]( 2.27) 0.89 [ 11.36](10.54) 16 1.00 [ -0.00]( 0.00) 0.98 [ 1.79]( 4.10) 32 1.00 [ -0.00]( 1.92) 1.01 [ -1.25]( 0.72) 64 1.00 [ -0.00]( 1.19) 1.01 [ -0.78]( 1.18) 128 1.00 [ -0.00]( 0.67) 1.01 [ -1.32]( 0.25) 256 1.00 [ -0.00]( 0.46) 1.03 [ -3.08]( 4.37) 512 1.00 [ -0.00]( 0.33) 1.01 [ -0.66]( 0.38) 768 1.00 [ -0.00]( 4.69) 1.02 [ -1.55](10.18) 1024 1.00 [ -0.00]( 2.71) 1.00 [ -0.00]( 4.43) ================================================================== Test : new-schbench-requests-per-second Units : Normalized Requests per second Interpretation: Higher is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1 1.00 [ 0.00]( 0.15) 0.99 [ -0.59]( 0.15) 2 1.00 [ 0.00]( 0.00) 0.99 [ -0.59]( 0.15) 4 1.00 [ 0.00]( 0.00) 0.99 [ -0.88]( 0.31) 8 1.00 [ 0.00]( 0.15) 1.00 [ 0.00]( 0.00) 16 1.00 [ 0.00]( 0.15) 1.00 [ 0.00]( 0.00) 32 1.00 [ 0.00]( 0.15) 1.00 [ 0.00]( 0.15) 64 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00) 128 1.00 [ 0.00](12.53) 0.98 [ -1.77](15.94) 256 1.00 [ 0.00]( 0.15) 0.99 [ -0.85]( 0.39) 512 1.00 [ 0.00]( 0.84) 1.00 [ 0.00]( 0.84) 768 1.00 [ 0.00]( 2.05) 0.99 [ -0.94]( 1.94) 1024 1.00 [ 0.00]( 2.90) 1.01 [ 1.35]( 2.18) ================================================================== Test : new-schbench-wakeup-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1 1.00 [ -0.00](12.99) 1.47 [-46.67](27.72) 2 1.00 [ -0.00]( 4.08) 0.85 [ 15.38]( 0.00) 4 1.00 [ -0.00]( 0.00) 0.82 [ 18.18]( 0.00) 8 1.00 [ -0.00]( 0.00) 1.27 [-27.27]( 3.78) 16 1.00 [ -0.00]( 4.56) 1.27 [-27.27]( 0.00) 32 1.00 [ -0.00]( 0.00) 1.00 [ -0.00]( 4.56) 64 1.00 [ -0.00]( 5.00) 1.00 [ -0.00]( 5.00) 128 1.00 [ -0.00]( 7.45) 1.25 [-25.00](14.68) 256 1.00 [ -0.00]( 2.70) 0.96 [ 4.48]( 8.12) 512 1.00 [ -0.00]( 0.00) 1.00 [ -0.00]( 0.00) 768 1.00 [ -0.00]( 1.66) 1.01 [ -1.47]( 2.52) 1024 1.00 [ -0.00]( 3.32) 1.01 [ -0.59]( 0.66) Note: The absolute numbers are very small until 256 threads (~10-15us) which may causes a small variation to appear as a large regression. ================================================================== Test : new-schbench-request-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) preempt_short_opt[pct imp](CV) 1 1.00 [ -0.00]( 0.14) 1.01 [ -1.06]( 0.27) 2 1.00 [ -0.00]( 0.14) 1.02 [ -1.60]( 0.23) 4 1.00 [ -0.00]( 0.00) 1.05 [ -4.53]( 1.73) 8 1.00 [ -0.00]( 0.14) 1.01 [ -0.53]( 0.14) 16 1.00 [ -0.00]( 1.49) 1.00 [ -0.26]( 1.23) 32 1.00 [ -0.00]( 0.89) 1.01 [ -0.79]( 0.00) 64 1.00 [ -0.00]( 1.43) 1.00 [ -0.26]( 0.98) 128 1.00 [ -0.00]( 2.78) 1.01 [ -1.18]( 4.09) 256 1.00 [ -0.00]( 0.13) 1.00 [ -0.25]( 0.26) 512 1.00 [ -0.00]( 6.72) 1.02 [ -2.20]( 5.45) 768 1.00 [ -0.00]( 3.42) 1.01 [ -0.52]( 4.21) 1024 1.00 [ -0.00]( 4.37) 1.01 [ -1.19]( 2.15) > > Several use cases has been used to testing the scheduling latency of short > slice tasks: > - cyclictest with a 3777us period and a 8ms slice alone > - cyclictest with a 3777us period and a 8ms slice. 2xNR_CPUS rt-app > tasks that run (8177us) and sleep (17777us) with a 16ms slice. > - cyclictest with a 3777us period and a 8ms slice. Hackbench with > 1 group using thread and pipe and a 16ms slice. I'll go check those configurations next and report back if I find anything out of the ordinary. Feel free to include: Tested-by: K Prateek Nayak -- Thanks and Regards, Prateek