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Ah! That is pretty sad for some of these benchmarks that are not a fan of large number of context-switches. I went back and tried some solutions floating in the community (thank you Mathieu and Aaron) > > Too bad I didn't save Peter's test hack to make EEVDF use the same > notion of fair (not a keeper) as I think that would likely prove it. More benchmarking with Mathieu's [1] and Aaron's [2] proposed changes on top of EEVDF + Curb Wakeup-Preemption: tl;dr - Hackbench is now happy with Mathieu's and Aaron's patches (I'm not looking with CFS baseline for now since Swapnil and Gautham are testing those) - Some unixbench variants are pretty happy in overloaded system. - schbench is pretty happy throughout. - tbench and DeathStarBench are still pretty unhappy. Most likely because of greater number of context switches but I'll get more concrete evidence for this. - Other micro-benchmarks tested are more or less perf neutral to EEVDF. o System Details - 3rd Generation EPYC System - 2 x 64C/128T - NPS1 mode o Kernels base (updated): tip:sched/core at commit 88c56cfeaec4 ("sched/fair: Block nohz tick_stop when cfs bandwidth in use") eevdf: tip:sched/core at commit c1fc6484e1fb ("sched/rt: sysctl_sched_rr_timeslice show default timeslice after reset") eevdf_curb: tip:sched/core at commit 63304558ba5d ("sched/eevdf:Curb wakeup-preemption") eevdf-curb+mathieu: eevdf + cheery-pick commit e242aa146918 ("sched/eevdf: Curb wakeup-preemption") + Mathieu's patches [1] eevdf-curb+mathieu+aaron eevdf-curb+mathieu + Aaron's patch [2] [References] [1] "sched: Skip queued wakeups only when L2 is shared" (https://lore.kernel.org/all/20230822113133.643238-1-mathieu.desnoyers@efficios.com/) [2] "Reduce cost of accessing tg->load_avg" (https://lore.kernel.org/lkml/20230823060832.454842-1-aaron.lu@intel.com/) o Benchmark Results * - Interesting Regression ^ - Interesting Improvement ================================================================== Test : hackbench Units : Normalized time in seconds Interpretation: Lower is better Statistic : AMean ================================================================== Case: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) 1-groups 1.00 [ -0.00]( 2.64) 1.02 [ -1.98]( 1.89) 1.03 [ -2.83]( 2.42) 0.95 [ 5.10]( 2.65) 0.94 [ 5.67]( 2.07) ^ 2-groups 1.00 [ -0.00]( 2.97) 1.05 [ -5.18]( 2.04) 1.04 [ -4.24]( 1.25) 0.98 [ 1.88]( 1.99) 0.96 [ 3.76]( 2.64) ^ 4-groups 1.00 [ -0.00]( 1.84) 1.06 [ -6.07]( 2.38) 1.05 [ -5.42]( 1.68) 1.00 [ 0.43]( 1.50) 0.99 [ 0.65]( 0.97) 8-groups 1.00 [ -0.00]( 1.24) 1.07 [ -7.09]( 1.52) 1.07 [ -7.29]( 1.32) 0.91 [ 9.11]( 1.63) 0.93 [ 7.49]( 2.43) ^ 16-groups 1.00 [ -0.00]( 3.31) 1.05 [ -4.98]( 3.44) 1.05 [ -5.27]( 2.58) 0.74 [ 26.35]( 1.22) 0.69 [ 31.04]( 1.90) ^ ================================================================== Test : tbench Units : Normalized throughput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) 1 1.00 [ 0.00]( 1.08) 1.00 [ 0.42]( 0.18) 1.00 [ -0.03]( 0.06) 0.99 [ -0.57]( 0.27) 0.99 [ -0.51]( 0.97) 2 1.00 [ 0.00]( 0.69) 1.00 [ -0.09]( 0.63) 0.99 [ -0.81]( 0.63) 1.00 [ -0.15]( 0.74) 0.99 [ -0.76]( 0.76) 4 1.00 [ 0.00]( 0.70) 0.99 [ -1.20]( 0.86) 1.00 [ -0.26]( 1.19) 0.99 [ -1.08]( 1.03) 0.99 [ -1.43]( 0.84) 8 1.00 [ 0.00]( 0.85) 1.01 [ 0.56]( 0.22) 1.00 [ 0.35]( 0.73) 1.00 [ -0.32]( 0.53) 1.00 [ -0.22]( 1.45) 16 1.00 [ 0.00]( 2.18) 0.98 [ -1.82]( 1.99) 0.99 [ -0.92]( 1.36) 0.99 [ -1.19]( 1.54) 0.97 [ -3.33]( 1.44) 32 1.00 [ 0.00]( 3.84) 0.99 [ -0.88]( 4.29) 1.00 [ 0.06]( 2.21) 0.98 [ -1.92]( 3.60) 0.96 [ -4.36]( 2.45) 64 1.00 [ 0.00]( 7.06) 1.03 [ 3.45]( 1.71) 1.02 [ 1.68]( 3.06) 1.03 [ 2.60]( 3.37) 1.01 [ 0.57]( 3.97) 128 1.00 [ 0.00]( 0.88) 1.02 [ 1.54]( 0.65) 0.98 [ -1.74]( 0.62) 0.98 [ -1.63]( 1.85) 0.97 [ -3.33]( 1.83) 256 1.00 [ 0.00]( 0.88) 0.94 [ -5.67]( 0.19) 0.92 [ -8.10]( 0.50) 0.95 [ -4.94]( 0.21) 0.91 [ -8.74]( 1.55) * 512 1.00 [ 0.00]( 0.07) 0.91 [ -9.17]( 0.20) 0.90 [-10.39]( 0.29) 0.92 [ -8.37]( 1.51) 0.90 [ -9.73]( 0.05) * 1024 1.00 [ 0.00]( 0.30) 0.87 [-12.66]( 0.29) 0.86 [-13.64]( 0.49) 0.86 [-14.47]( 0.35) 0.87 [-13.44]( 0.26) * ================================================================== Test : stream-10 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) Copy 1.00 [ 0.00]( 8.87) 1.03 [ 2.94]( 4.32) 1.05 [ 5.23]( 2.73) 0.96 [ -3.92]( 7.61) 0.97 [ -3.28]( 5.93) Scale 1.00 [ 0.00]( 6.80) 1.01 [ 1.38]( 5.21) 1.01 [ 1.03]( 5.48) 1.03 [ 2.98]( 1.04) 0.99 [ -1.24]( 7.22) Add 1.00 [ 0.00]( 7.24) 1.01 [ 1.45]( 6.25) 1.01 [ 1.39]( 5.53) 1.02 [ 1.51]( 2.51) 0.98 [ -2.02]( 6.99) Triad 1.00 [ 0.00]( 5.00) 0.96 [ -3.63](10.74) 1.00 [ 0.18]( 7.14) 0.99 [ -0.78]( 5.21) 1.00 [ 0.45]( 2.91) ================================================================== Test : stream-100 Units : Normalized Bandwidth, MB/s Interpretation: Higher is better Statistic : HMean ================================================================== Test: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) Copy 1.00 [ 0.00]( 0.45) 1.00 [ -0.27]( 0.70) 1.00 [ -0.27]( 1.08) 1.00 [ -0.48]( 1.44) 0.98 [ -2.02]( 4.84) Scale 1.00 [ 0.00]( 4.40) 0.98 [ -1.86]( 6.55) 1.01 [ 1.25]( 0.82) 0.99 [ -0.85]( 4.98) 1.01 [ 1.10]( 1.07) Add 1.00 [ 0.00]( 4.97) 0.99 [ -0.91]( 6.53) 1.02 [ 2.20]( 1.08) 1.00 [ 0.26]( 4.90) 1.00 [ 0.11]( 2.37) Triad 1.00 [ 0.00]( 0.24) 0.95 [ -4.85]( 6.66) 0.98 [ -2.19]( 4.56) 0.97 [ -2.80]( 5.56) 0.98 [ -1.58]( 2.15) ================================================================== Test : netperf Units : Normalized Througput Interpretation: Higher is better Statistic : AMean ================================================================== Clients: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) 1-clients 1.00 [ 0.00]( 0.46) 0.99 [ -1.26]( 0.46) 0.99 [ -0.67]( 0.70) 1.00 [ -0.13]( 0.30) 0.99 [ -1.46]( 0.37) 2-clients 1.00 [ 0.00]( 0.75) 0.99 [ -0.87]( 0.38) 1.00 [ -0.21]( 0.92) 1.00 [ 0.13]( 0.32) 0.99 [ -1.47]( 1.05) 4-clients 1.00 [ 0.00]( 0.84) 1.00 [ -0.45]( 0.72) 1.00 [ -0.14]( 0.83) 1.00 [ -0.10]( 0.60) 0.99 [ -0.70]( 0.78) 8-clients 1.00 [ 0.00]( 0.78) 0.99 [ -1.07]( 0.98) 0.99 [ -0.63]( 0.82) 1.00 [ -0.49]( 0.85) 0.99 [ -0.83]( 0.81) 16-clients 1.00 [ 0.00]( 2.56) 1.00 [ -0.29]( 0.70) 1.00 [ 0.03]( 1.26) 1.00 [ 0.17]( 0.66) 1.00 [ -0.43]( 0.80) 32-clients 1.00 [ 0.00]( 1.03) 0.99 [ -0.76]( 0.74) 0.99 [ -0.73]( 1.24) 1.00 [ -0.49]( 1.45) 0.99 [ -1.29]( 1.88) 64-clients 1.00 [ 0.00]( 2.69) 0.98 [ -1.96]( 2.24) 0.99 [ -1.39]( 3.06) 0.98 [ -1.78]( 3.00) 0.98 [ -2.31]( 3.00) 128-clients 1.00 [ 0.00]( 1.91) 1.00 [ -0.43]( 1.72) 0.99 [ -0.64]( 1.64) 0.97 [ -2.72]( 1.34) 1.00 [ -0.49]( 1.83) 256-clients 1.00 [ 0.00]( 2.21) 1.02 [ 2.23]( 4.44) 1.00 [ 0.29]( 3.71) 1.01 [ 1.49]( 3.72) 1.02 [ 2.17]( 2.50) 512-clients 1.00 [ 0.00](45.18) 1.00 [ 0.10](52.42) 0.97 [ -2.76](57.69) 0.99 [ -1.14](49.76) 0.99 [ -0.58](50.33) ================================================================== Test : schbench (old) Units : Normalized 99th percentile latency in us Interpretation: Lower is better Statistic : Median ================================================================== #workers: base[pct imp](CV) eevdf[pct imp](CV) eevdf-curb[pct imp](CV) eevdf-curb+mathieu[pct imp](CV) eevdf-curb+mathieu+aaron[pct imp](CV) 1 1.00 [ -0.00](12.03) 1.09 [ -8.70]( 2.28) 1.09 [ -8.70]( 2.28) 0.96 [ 4.35](17.83) 1.13 [-13.04]( 5.95) 2 1.00 [ -0.00]( 9.36) 1.08 [ -7.69]( 6.42) 0.96 [ 3.85](11.02) 1.00 [ -0.00]( 2.19) 0.92 [ 7.69]( 0.00) 4 1.00 [ -0.00]( 1.95) 1.00 [ -0.00]( 3.77) 0.93 [ 6.67]( 4.22) 1.03 [ -3.33]( 3.81) 0.93 [ 6.67]( 5.52) 8 1.00 [ -0.00]( 9.01) 1.03 [ -2.70](13.83) 0.95 [ 5.41]( 1.63) 1.08 [ -8.11]( 2.94) 1.05 [ -5.41]( 3.01) 16 1.00 [ -0.00]( 3.08) 0.94 [ 6.00]( 4.37) 1.00 [ -0.00]( 3.53) 1.06 [ -6.00]( 1.10) 0.98 [ 2.00]( 5.51) 32 1.00 [ -0.00]( 0.75) 1.05 [ -5.19]( 8.69) 1.01 [ -1.30]( 5.14) 1.01 [ -1.30]( 5.14) 0.95 [ 5.19]( 5.36) 64 1.00 [ -0.00]( 2.15) 0.96 [ 4.29]( 2.30) 0.98 [ 1.84]( 2.56) 0.93 [ 7.36](14.38) 0.90 [ 9.82](15.50) 128 1.00 [ -0.00]( 5.18) 1.01 [ -0.57](12.12) 1.14 [-14.29]( 6.76) 1.09 [ -9.43]( 8.88) 1.04 [ -4.29]( 4.46) 256 1.00 [ -0.00]( 4.18) 0.16 [ 83.86](26.04) 0.18 [ 82.36]( 8.04) 0.16 [ 83.69](21.07) 0.19 [ 81.29]( 2.30) ^ 512 1.00 [ -0.00]( 2.10) 0.29 [ 70.52]( 5.62) 0.29 [ 70.80]( 3.48) 0.30 [ 70.45]( 1.73) 0.30 [ 70.17]( 5.31) ^ ================================================================== Test : Unixbench Units : Various, Throughput Interpretation: Higher is better Statistic : AMean, Hmean (Specified) ================================================================== base eevdf eevdf_curb eevdf-curb+mathieu eevdf-curb+mathieu+aaron Hmean unixbench-dhry2reg-1 41407024.82 ( 0.00%) 41248390.97 ( -0.38%) 41576959.80 ( 0.41%) 41641988.85 ( 0.57%) 40989184.46 ( -1.01%) Hmean unixbench-dhry2reg-512 6249629291.88 ( 0.00%) 6239969914.15 ( -0.15%) 6223263669.12 ( -0.42%) 6258072789.83 ( 0.14%) 6243186854.90 ( -0.10%) Amean unixbench-syscall-1 2922580.63 ( 0.00%) 2968518.27 * -1.57%* 2923093.63 ( -0.02%) 2887947.73 * 1.19%* 2921456.17 ( 0.04%) Amean unixbench-syscall-512 7606400.73 ( 0.00%) 7790656.20 * 2.42%* 8300980.77 * 9.13%* 7743306.30 * 1.80%* 8284260.83 * 8.91%* ^ Hmean unixbench-pipe-1 2574942.54 ( 0.00%) 2535689.01 * -1.52%* 2472718.52 * -3.97%* 2558661.32 * -0.63%* 2567755.92 * -0.28%* Hmean unixbench-pipe-512 364489246.31 ( 0.00%) 361385055.25 * -0.85%* 363215893.62 * -0.35%* 368809317.33 * 1.19%* 370896020.69 * 1.76%* Hmean unixbench-spawn-1 4428.94 ( 0.00%) 4506.26 ( 1.75%) 4520.53 ( 2.07%) 4778.12 * 7.88%* 4353.00 ( -1.71%) Hmean unixbench-spawn-512 68883.47 ( 0.00%) 69380.09 ( 0.72%) 69709.04 * 1.20%* 70278.77 * 2.03%* 71187.47 * 3.34%* Hmean unixbench-execl-1 3878.47 ( 0.00%) 3824.57 * -1.39%* 3835.20 * -1.12%* 3802.46 * -1.96%* 3830.36 * -1.24%* Hmean unixbench-execl-512 11638.84 ( 0.00%) 12288.64 ( 5.58%) 13096.25 * 12.52%* 12976.96 * 11.50%* 12468.95 ( 7.13%) ^ ================================================================== Test : ycsb-mongodb Units : Throughput Interpretation: Higher is better Statistic : AMean ================================================================== tip: 301757.33 (var: 1.63%) (%diff: +0.00%) eevdf: 309589.33 (var: 1.41%) (%diff: +2.60%) eevdf_curb; 303940.00 (var: 1.09%) (%diff: +0.72%) eevdf-curb+mathieu: 303055.67 (var: 4.14%) (%diff: +0.43%) eevdf-curb+mathieu+aaron: 297810.00 (var: 0.45%) (%diff: -1.31%) ================================================================== Test : DeathStarBench Units : %diff of Throughput Interpretation: Higher is better Statistic : AMean ================================================================== Scaling base eevdf eevdf_curb eevdf-curb+mathieu eevdf-curb+mathieu+aaron 1CCD 0% -14.95% -16.35% -16.67% -16.22% * 2CCD 0% -13.50% -15.94% -18.03% -17.93% * 4CCD 0% -8.49% -11.07% -13.11% -14.57% * 8CCD 0% -4.61% -4.87% -5.72% -6.02% * -- I'll go back and dig further. -- Thanks and Regards, Prateek