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Here are my results from a dual socket 3rd Generation EPYC system. tl;dr I don't see any improvement and a few regressions too but few of those data points also have a lot of variance. o Machine details - 3rd Generation EPYC System - 2 sockets each with 64C/128T - NPS1 (Each socket is a NUMA node) - C2 Disabled (POLL and C1(MWAIT) remained enabled) o Kernel details tip: tip:sched/core at commit 914873bc7df9 ("Merge tag 'x86-build-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip") allow_imb: tip + this series as is o Benchmark results ================================================================== Test : hackbench Units : Normalized time in seconds Interpretation: Lower is better Statistic : AMean ================================================================== Case: tip[pct imp](CV) allow_imb[pct imp](CV) 1-groups 1.00 [ -0.00](13.74) 1.03 [ -3.20]( 9.18) 2-groups 1.00 [ -0.00]( 9.58) 1.06 [ -6.46]( 7.63) 4-groups 1.00 [ -0.00]( 2.10) 1.01 [ -1.30]( 1.90) 8-groups 1.00 [ -0.00]( 1.51) 0.99 [ 1.42]( 0.91) 16-groups 1.00 [ -0.00]( 1.10) 0.99 [ 1.09]( 1.13) ================================================================== Test : tbench Units : Normalized throughput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: tip[pct imp](CV) allow_imb[pct imp](CV) 1 1.00 [ 0.00]( 0.82) 1.01 [ 1.11]( 0.27) 2 1.00 [ 0.00]( 1.13) 1.00 [ -0.05]( 0.62) 4 1.00 [ 0.00]( 1.12) 1.02 [ 2.36]( 0.19) 8 1.00 [ 0.00]( 0.93) 1.01 [ 1.02]( 0.86) 16 1.00 [ 0.00]( 0.38) 1.01 [ 0.71]( 1.71) 32 1.00 [ 0.00]( 0.66) 1.01 [ 1.31]( 1.88) 64 1.00 [ 0.00]( 1.18) 0.98 [ -1.60]( 2.90) 128 1.00 [ 0.00]( 1.12) 1.02 [ 1.60]( 0.42) 256 1.00 [ 0.00]( 0.42) 1.00 [ 0.40]( 0.80) 512 1.00 [ 0.00]( 0.14) 1.01 [ 0.97]( 0.25) 1024 1.00 [ 0.00]( 0.26) 1.01 [ 1.29]( 0.19) ================================================================== Test : stream-10 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: tip[pct imp](CV) allow_imb[pct imp](CV) Copy 1.00 [ 0.00]( 8.37) 1.01 [ 1.00]( 5.71) Scale 1.00 [ 0.00]( 2.85) 0.98 [ -1.94]( 5.23) Add 1.00 [ 0.00]( 3.39) 0.99 [ -1.39]( 4.77) Triad 1.00 [ 0.00]( 6.39) 1.05 [ 5.15]( 5.62) ================================================================== Test : stream-100 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: tip[pct imp](CV) allow_imb[pct imp](CV) Copy 1.00 [ 0.00]( 3.91) 1.01 [ 1.28]( 2.01) Scale 1.00 [ 0.00]( 4.34) 0.99 [ -0.65]( 3.74) Add 1.00 [ 0.00]( 4.14) 1.01 [ 0.54]( 1.63) Triad 1.00 [ 0.00]( 1.00) 0.98 [ -2.28]( 4.89) ================================================================== Test : netperf Units : Normalized Througput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: tip[pct imp](CV) allow_imb[pct imp](CV) 1-clients 1.00 [ 0.00]( 0.41) 1.01 [ 1.17]( 0.39) 2-clients 1.00 [ 0.00]( 0.58) 1.01 [ 1.00]( 0.40) 4-clients 1.00 [ 0.00]( 0.35) 1.01 [ 0.73]( 0.50) 8-clients 1.00 [ 0.00]( 0.48) 1.00 [ 0.42]( 0.67) 16-clients 1.00 [ 0.00]( 0.66) 1.01 [ 0.84]( 0.57) 32-clients 1.00 [ 0.00]( 1.15) 1.01 [ 0.82]( 0.96) 64-clients 1.00 [ 0.00]( 1.38) 1.00 [ -0.24]( 3.09) 128-clients 1.00 [ 0.00]( 0.87) 1.00 [ -0.16]( 1.02) 256-clients 1.00 [ 0.00]( 5.36) 1.01 [ 0.66]( 4.55) 512-clients 1.00 [ 0.00](54.39) 0.98 [ -1.59](57.35) ================================================================== Test : schbench Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) allow_imb[pct imp](CV) 1 1.00 [ -0.00]( 8.54) 1.04 [ -4.35]( 3.69) 2 1.00 [ -0.00]( 1.15) 0.96 [ 4.00]( 0.00) 4 1.00 [ -0.00](13.46) 1.02 [ -2.08]( 2.04) 8 1.00 [ -0.00]( 7.14) 0.82 [ 17.54]( 9.30) 16 1.00 [ -0.00]( 3.49) 1.05 [ -5.08]( 7.83) 32 1.00 [ -0.00]( 1.06) 1.01 [ -1.06]( 5.88) 64 1.00 [ -0.00]( 5.48) 1.05 [ -4.65]( 2.71) 128 1.00 [ -0.00](10.45) 1.09 [ -9.11](14.18) 256 1.00 [ -0.00](31.14) 1.05 [ -5.15]( 9.79) 512 1.00 [ -0.00]( 1.52) 0.96 [ 4.30]( 0.26) ================================================================== Test : new-schbench-requests-per-second Units : Normalized Requests per second Interpretation: Higher is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) allow_imb[pct imp](CV) 1 1.00 [ 0.00]( 1.07) 1.00 [ 0.29]( 0.61) 2 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.26) 4 1.00 [ 0.00]( 0.00) 1.00 [ -0.29]( 0.00) 8 1.00 [ 0.00]( 0.15) 1.00 [ 0.29]( 0.15) 16 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00) 32 1.00 [ 0.00]( 3.41) 0.97 [ -2.86]( 2.91) 64 1.00 [ 0.00]( 1.05) 0.97 [ -3.17]( 7.39) 128 1.00 [ 0.00]( 0.00) 1.00 [ -0.38]( 0.39) 256 1.00 [ 0.00]( 0.72) 1.01 [ 0.61]( 0.96) 512 1.00 [ 0.00]( 0.57) 1.01 [ 0.72]( 0.21) ================================================================== Test : new-schbench-wakeup-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) allow_imb[pct imp](CV) 1 1.00 [ -0.00]( 9.11) 0.69 [ 31.25]( 8.13) 2 1.00 [ -0.00]( 0.00) 0.93 [ 7.14]( 8.37) 4 1.00 [ -0.00]( 3.78) 1.07 [ -7.14](14.79) 8 1.00 [ -0.00]( 0.00) 1.08 [ -8.33]( 7.56) 16 1.00 [ -0.00]( 7.56) 1.08 [ -7.69](34.36) 32 1.00 [ -0.00](15.11) 1.00 [ -0.00](12.99) 64 1.00 [ -0.00]( 9.63) 0.80 [ 20.00](11.17) 128 1.00 [ -0.00]( 4.86) 0.98 [ 2.01](13.01) 256 1.00 [ -0.00]( 2.34) 1.01 [ -1.00]( 3.51) 512 1.00 [ -0.00]( 0.40) 1.00 [ 0.38]( 0.20) ================================================================== Test : new-schbench-request-latency Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: tip[pct imp](CV) allow_imb[pct imp](CV) 1 1.00 [ -0.00]( 2.73) 0.98 [ 2.08]( 3.51) 2 1.00 [ -0.00]( 0.87) 0.99 [ 0.54]( 3.29) 4 1.00 [ -0.00]( 1.21) 1.06 [ -5.92]( 0.82) 8 1.00 [ -0.00]( 0.27) 1.03 [ -3.15]( 1.86) 16 1.00 [ -0.00]( 4.04) 1.00 [ -0.27]( 2.27) 32 1.00 [ -0.00]( 7.35) 1.30 [-30.45](20.57) 64 1.00 [ -0.00]( 3.54) 1.01 [ -0.67]( 0.82) 128 1.00 [ -0.00]( 0.37) 1.00 [ 0.21]( 0.18) 256 1.00 [ -0.00]( 9.57) 0.99 [ 1.43]( 7.69) 512 1.00 [ -0.00]( 1.82) 1.02 [ -2.10]( 0.89) ================================================================== Test : Various longer running benchmarks Units : %diff in throughput reported Interpretation: Higher is better Statistic : Median ================================================================== Benchmarks: %diff ycsb-cassandra 0.07% ycsb-mongodb -0.66% deathstarbench-1x 0.36% deathstarbench-2x 2.39% deathstarbench-3x -0.09% deathstarbench-6x 1.53% hammerdb+mysql 16VU -0.27% hammerdb+mysql 64VU -0.32% --- I cannot make a hard case for this optimization. You can perhaps share your iperf numbers if you are seeing significant improvements there. -- Thanks and Regards, Prateek