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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Px7awglfbqGjX4AvKobW8dOSwNCjStAWIq534RkhZdZZZglkoxUb3fhwFOAqhEOodw6rAsVdOUq+1GI8k9HNyd4ZpkukV+dN++tYM0RshTfzLIMG4pURFrHQGgeCZkjbEf4zthTkqJB19aqHfzDV8+O1pLCjeCzvKoJnzyQeCxgjs3bXWY/PuZReu6T84JvgGLy3Vu0ivcFk7alKLqBLBXrTgA+W//oiXe/xSFmSqi4w+LpzMNTsucTcO1BW5g8TT3qSV63pKiRA+ONQEUKaaQoYI85vBebp2a+zHS4iLugy6gA/FcPOYrMGkZpUHopmCr50ScHJhk/uK7RKoWkbRTNQe0b5l3DmF3H9Z3sQ05iGtd2K5H99UlRNlOgvoXv5Wv3wtiw4Y4X0O8hDdt0jE9N83c0Cq710XuuW96Arulvb9QaZ67Qwk1oF3OqLHLiN X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Feb 2026 04:20:55.1909 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0329c607-89ac-447b-8e75-08de6ddbf1a4 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=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA4E.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7704 Hello Peter, On 1/30/2026 3:04 PM, Peter Zijlstra wrote: > Two issues related to reweight_entity() were raised; poking at all that got me > these patches. > > They're in queue.git/sched/core and I spend most of yesterday staring at traces > trying to find anything wrong. So far, so good. > > Please test. For queue:sched/core at commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()"), here are the results: o tl;dr No consistent regressions observed so far. Ones that have a large %diff either have a small baseline (like < 10us latency for schbench) or have a large CV (like for 16-groups of hackbench). Feel free to include: Tested-by: K Prateek Nayak o Full results Baseline was commit cee73b1e840c ("Merge tag 'riscv-for-linus-7.0-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux"). Testing was done on a 2 x 128C/256T 4th Generation EPYC system (Zen4c) with boost enabled and C2 disabled. ================================================================== Test : hackbench Units : Normalized time in seconds Interpretation: Lower is better Statistic : AMean ================================================================== Case: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1-groups 1.00 [ -0.00](11.97) 1.09 [ -8.80](15.94) 2-groups 1.00 [ -0.00](14.01) 1.07 [ -7.40]( 8.55) 4-groups 1.00 [ -0.00]( 8.54) 0.98 [ 1.60]( 6.49) 8-groups 1.00 [ -0.00]( 2.78) 1.03 [ -3.01]( 2.35) 16-groups 1.00 [ -0.00]( 3.64) 1.08 [ -7.55]( 7.69) ================================================================== Test : tbench Units : Normalized throughput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1 1.00 [ 0.00]( 0.20) 1.01 [ 1.04]( 0.06) 2 1.00 [ 0.00]( 0.37) 1.01 [ 1.22]( 0.07) 4 1.00 [ 0.00]( 0.37) 1.02 [ 1.53]( 0.35) 8 1.00 [ 0.00]( 0.43) 1.01 [ 1.10]( 0.57) 16 1.00 [ 0.00]( 0.11) 1.01 [ 0.83]( 0.25) 32 1.00 [ 0.00]( 1.61) 1.01 [ 0.86]( 0.57) 64 1.00 [ 0.00]( 0.19) 1.00 [ 0.21]( 1.48) 128 1.00 [ 0.00]( 0.22) 0.99 [ -1.23]( 1.53) 256 1.00 [ 0.00]( 0.22) 1.01 [ 0.58]( 0.42) 512 1.00 [ 0.00]( 2.23) 1.02 [ 1.83]( 3.35) 1024 1.00 [ 0.00]( 0.58) 1.00 [ 0.10]( 0.45) 2048 1.00 [ 0.00]( 0.46) 1.01 [ 0.51]( 0.07) ================================================================== Test : stream-10 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) Copy 1.00 [ 0.00]( 0.94) 1.00 [ -0.31]( 1.61) Scale 1.00 [ 0.00]( 0.85) 1.00 [ -0.45]( 2.04) Add 1.00 [ 0.00]( 0.84) 0.99 [ -0.55]( 1.77) Triad 1.00 [ 0.00]( 0.78) 1.00 [ -0.46]( 1.63) ================================================================== Test : stream-100 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) Copy 1.00 [ 0.00]( 1.16) 1.00 [ 0.34]( 0.45) Scale 1.00 [ 0.00]( 1.53) 1.01 [ 0.59]( 0.53) Add 1.00 [ 0.00]( 1.14) 1.01 [ 0.60]( 0.47) Triad 1.00 [ 0.00]( 1.14) 1.01 [ 0.52]( 0.34) ================================================================== Test : netperf Units : Normalized Througput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1-clients 1.00 [ 0.00]( 0.14) 1.01 [ 0.96]( 0.10) 2-clients 1.00 [ 0.00]( 0.34) 1.01 [ 0.92]( 0.24) 4-clients 1.00 [ 0.00]( 0.13) 1.01 [ 0.71]( 0.94) 8-clients 1.00 [ 0.00]( 0.46) 1.01 [ 0.69]( 0.27) 16-clients 1.00 [ 0.00]( 0.62) 1.01 [ 0.74]( 0.91) 32-clients 1.00 [ 0.00]( 1.19) 1.01 [ 1.04]( 1.19) 64-clients 1.00 [ 0.00]( 1.81) 1.01 [ 0.62]( 1.64) 128-clients 1.00 [ 0.00]( 1.90) 1.00 [ 0.30]( 1.93) 256-clients 1.00 [ 0.00]( 1.76) 1.00 [ 0.27]( 1.75) 512-clients 1.00 [ 0.00]( 6.23) 0.99 [ -0.52]( 5.66) 768-clients 1.00 [ 0.00](33.00) 0.99 [ -0.91](34.32) 1024-clients 1.00 [ 0.00](38.21) 1.00 [ -0.18](32.98) ================================================================== Test : schbench Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1 1.00 [ -0.00](15.02) 1.47 [-47.06](32.99) 2 1.00 [ -0.00](17.83) 0.97 [ 2.94]( 4.58) 4 1.00 [ -0.00](12.22) 1.00 [ -0.00]( 3.07) 8 1.00 [ -0.00]( 2.38) 1.00 [ -0.00]( 2.38) 16 1.00 [ -0.00]( 1.92) 1.08 [ -7.69]( 3.15) 32 1.00 [ -0.00]( 2.37) 1.00 [ -0.00]( 0.78) 64 1.00 [ -0.00]( 0.85) 1.01 [ -0.85]( 3.92) 128 1.00 [ -0.00]( 1.21) 1.00 [ -0.48]( 1.47) 256 1.00 [ -0.00]( 0.39) 1.00 [ -0.00](12.20) 512 1.00 [ -0.00]( 0.20) 1.02 [ -2.07]( 2.04) 768 1.00 [ -0.00]( 5.68) 0.97 [ 3.11]( 7.62) 1024 1.00 [ -0.00]( 4.23) 1.01 [ -0.77]( 4.71) ================================================================== Test : new-schbench-requests-per-second Units : Normalized Requests per second Interpretation: Higher is better Statistic : Median ================================================================== #workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00) 2 1.00 [ 0.00]( 0.15) 1.00 [ -0.29]( 0.00) 4 1.00 [ 0.00]( 0.00) 1.00 [ -0.29]( 0.00) 8 1.00 [ 0.00]( 0.00) 1.00 [ -0.29]( 0.00) 16 1.00 [ 0.00]( 0.15) 1.00 [ -0.29]( 0.15) 32 1.00 [ 0.00]( 0.15) 0.99 [ -0.59]( 0.15) 64 1.00 [ 0.00]( 0.15) 0.99 [ -0.59]( 0.00) 128 1.00 [ 0.00](13.29) 0.84 [-16.00](16.15) 256 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00) 512 1.00 [ 0.00]( 1.72) 1.00 [ 0.00]( 1.26) 768 1.00 [ 0.00]( 0.44) 0.99 [ -1.18]( 0.00) 1024 1.00 [ 0.00]( 0.37) 0.99 [ -0.54]( 0.42) ================================================================== Test : new-schbench-wakeup-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1 1.00 [ -0.00](14.91) 1.25 [-25.00](11.07) 2 1.00 [ -0.00](18.20) 1.00 [ -0.00]( 4.43) 4 1.00 [ -0.00](15.10) 0.92 [ 7.69]( 9.11) 8 1.00 [ -0.00]( 4.84) 1.00 [ -0.00]( 0.00) 16 1.00 [ -0.00]( 0.00) 1.09 [ -9.09]( 4.43) 32 1.00 [ -0.00]( 4.84) 0.91 [ 9.09]( 0.00) 64 1.00 [ -0.00](10.68) 1.00 [ -0.00]( 5.53) 128 1.00 [ -0.00]( 9.68) 1.20 [-20.00]( 9.11) 256 1.00 [ -0.00]( 3.88) 0.96 [ 4.37]( 2.17) 512 1.00 [ -0.00]( 1.80) 1.00 [ -0.37]( 1.43) 768 1.00 [ -0.00]( 0.92) 1.00 [ -0.00]( 0.00) 1024 1.00 [ -0.00]( 0.00) 1.00 [ -0.00]( 2.64) ================================================================== Test : new-schbench-request-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1 1.00 [ -0.00]( 0.27) 1.00 [ -0.00]( 0.00) 2 1.00 [ -0.00]( 0.00) 1.00 [ -0.26]( 0.00) 4 1.00 [ -0.00]( 0.14) 1.00 [ -0.26]( 0.00) 8 1.00 [ -0.00]( 0.00) 1.00 [ -0.26]( 0.00) 16 1.00 [ -0.00]( 0.14) 1.00 [ -0.26]( 0.00) 32 1.00 [ -0.00]( 0.27) 1.01 [ -0.53]( 0.49) 64 1.00 [ -0.00]( 0.14) 1.01 [ -0.53](30.11) 128 1.00 [ -0.00]( 2.99) 1.04 [ -4.41]( 3.96) 256 1.00 [ -0.00]( 0.52) 0.99 [ 1.15]( 0.43) 512 1.00 [ -0.00]( 2.81) 1.01 [ -1.22]( 2.69) 768 1.00 [ -0.00]( 0.46) 0.97 [ 3.27]( 0.46) 1024 1.00 [ -0.00]( 0.14) 1.00 [ -0.35]( 0.29) I reran hackbench just to make sure the regression was a blip and as expected there isn't any regression on the rerun: ================================================================== Test : hackbench-rerun Units : Normalized time in seconds Interpretation: Lower is better Statistic : AMean ================================================================== Case: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV) 1-groups 1.00 [ -0.00](13.66) 0.93 [ 6.88]( 3.91) 2-groups 1.00 [ -0.00]( 9.40) 0.87 [ 12.95](14.81) 4-groups 1.00 [ -0.00]( 3.58) 0.98 [ 2.03]( 3.67) 8-groups 1.00 [ -0.00]( 3.52) 1.01 [ -1.28]( 2.73) 16-groups 1.00 [ -0.00]( 7.05) 0.99 [ 1.11]( 3.96) -- Thanks and Regards, Prateek