SYSBENCHTHREAD ============== http://xenbits.xen.org/people/dariof/benchmarks/results/linux/core-sched/mmtests/boxes/wayrath/coresched-email-5_sysbenchthread.txt v v BM BM BM BM BM BM BM-HT BM-noHT HT noHT csc-HT csc_stallfix-HT csc_tim-HT csc_vruntime-HT Amean 1 1.12 ( 0.00%) 1.11 ( 0.38%) 1.14 * -2.43%* 1.15 * -2.81%* 8.49 *-659.72%* 8.43 *-654.99%* 8.42 *-653.96%* 8.38 *-649.74%* Amean 3 1.11 ( 0.00%) 1.11 ( 0.00%) 1.14 * -2.70%* 1.14 * -2.96%* 8.35 *-651.29%* 8.42 *-657.20%* 8.34 *-650.77%* 8.41 *-656.56%* Amean 5 1.11 ( 0.00%) 1.11 ( 0.00%) 1.14 * -2.70%* 1.14 * -2.82%* 8.34 *-649.81%* 8.41 *-655.46%* 8.32 *-647.75%* 8.34 *-649.42%* Amean 7 1.12 ( 0.00%) 1.11 ( 0.38%) 1.14 * -2.43%* 1.15 * -2.69%* 8.31 *-643.48%* 8.40 *-652.05%* 8.41 *-653.20%* 8.33 *-645.65%* Amean 12 1.12 ( 0.00%) 1.12 ( 0.00%) 1.14 * -2.43%* 1.14 * -2.56%* 8.38 *-651.34%* 8.41 *-654.16%* 8.32 *-645.71%* 8.38 *-651.09%* Amean 16 1.11 ( 0.00%) 1.11 ( -0.13%) 1.15 * -3.08%* 1.14 * -2.57%* 8.42 *-656.61%* 8.36 *-651.60%* 8.31 *-646.73%* 8.39 *-654.30%* Stddev 1 0.01 ( 0.00%) 0.01 ( 49.47%) 0.01 ( 64.27%) 0.01 ( 39.86%) 0.08 (-414.47%) 0.16 (-976.34%) 0.01 ( 36.42%) 0.09 (-525.69%) Stddev 3 0.00 ( 0.00%) 0.00 ( 0.00%) 0.00 ( 0.00%) 0.01 (-108.17%) 0.13 (-3211.60%) 0.10 (-2531.86%) 0.06 (-1515.55%) 0.10 (-2467.10%) Stddev 5 0.00 ( 0.00%) 0.00 ( 0.00%) 0.00 ( 0.00%) 0.01 ( -9.54%) 0.12 (-2271.92%) 0.10 (-1917.42%) 0.09 (-1700.00%) 0.09 (-1725.38%) Stddev 7 0.01 ( 0.00%) 0.01 ( 20.53%) 0.01 ( 43.80%) 0.01 ( 0.00%) 0.13 (-1255.69%) 0.10 (-988.21%) 0.03 (-247.93%) 0.08 (-762.68%) Stddev 12 0.01 ( 0.00%) 0.01 ( -24.03%) 0.00 ( 37.98%) 0.01 ( 0.00%) 0.13 (-1577.68%) 0.10 (-1210.31%) 0.10 (-1140.97%) 0.06 (-644.73%) Stddev 16 0.00 ( 0.00%) 0.01 ( -9.54%) 0.01 ( -54.92%) 0.00 ( 22.54%) 0.15 (-3032.73%) 0.12 (-2401.20%) 0.11 (-2206.51%) 0.07 (-1304.28%) v v VM VM VM VM VM VM VM-HT VM-noHT HT noHT csc-HT csc_stallfix-HT csc_tim-HT csc_vruntime-HT Amean 1 1.43 ( 0.00%) 1.15 * 19.56%* 1.15 * 19.36%* 1.19 * 16.67%* 1.16 * 19.16%* 1.17 * 18.46%* 1.16 * 18.66%* 1.16 * 18.86%* Amean 3 1.43 ( 0.00%) 1.16 * 19.16%* 1.16 * 19.26%* 1.17 * 18.46%* 1.16 * 19.16%* 1.21 * 15.17%* 1.16 * 18.86%* 1.21 * 15.27%* Amean 5 1.43 ( 0.00%) 1.15 * 19.28%* 1.18 * 17.78%* 1.17 * 18.08%* 1.16 * 19.18%* 1.17 * 18.18%* 1.16 * 19.08%* 1.18 * 17.58%* Amean 7 1.43 ( 0.00%) 1.16 * 19.26%* 1.16 * 18.86%* 1.17 * 18.56%* 1.16 * 19.16%* 1.19 * 16.57%* 1.15 * 19.36%* 1.15 * 19.36%* Amean 12 1.44 ( 0.00%) 1.16 * 19.44%* 1.16 * 19.44%* 1.17 * 18.75%* 1.16 * 19.25%* 1.18 * 18.06%* 1.16 * 19.15%* 1.16 * 19.44%* Amean 16 1.46 ( 0.00%) 1.16 * 20.37%* 1.16 * 20.37%* 1.16 * 20.47%* 1.16 * 20.37%* 1.17 * 19.59%* 1.17 * 20.08%* 1.16 * 20.37%* Stddev 1 0.00 ( 0.00%) 0.00 ( 0.00%) 0.01 ( -41.42%) 0.05 (-1314.21%) 0.00 ( -29.10%) 0.00 ( -29.10%) 0.01 (-236.65%) 0.02 (-316.33%) Stddev 3 0.00 ( 0.00%) 0.00 ( -29.10%) 0.01 (-108.17%) 0.03 (-773.69%) 0.01 (-100.00%) 0.09 (-2324.18%) 0.01 (-138.05%) 0.06 (-1378.74%) Stddev 5 0.00 ( 0.00%) 0.01 ( -99.00%) 0.05 ( -99.00%) 0.02 ( -99.00%) 0.01 ( -99.00%) 0.01 ( -99.00%) 0.01 ( -99.00%) 0.04 ( -99.00%) Stddev 7 0.00 ( 0.00%) 0.01 ( -41.42%) 0.01 (-138.05%) 0.02 (-468.62%) 0.01 (-100.00%) 0.06 (-1600.00%) 0.01 (-108.17%) 0.01 ( -41.42%) Stddev 12 0.00 ( 0.00%) 0.00 ( 100.00%) 0.00 ( 100.00%) 0.03 (-11031521092846084.00%) 0.00 (-2034518927425100.00%) 0.01 (-4169523056347680.00%) 0.01 (-2228703820443891.00%) 0.00 ( 100.00%) Stddev 16 0.05 ( 0.00%) 0.00 ( 92.31%) 0.00 ( 92.31%) 0.00 ( 100.00%) 0.00 ( 92.31%) 0.01 ( 80.64%) 0.01 ( 89.12%) 0.00 ( 92.31%) v v VM VM VM VM VM VM VM-v4-HT VM-v4-noHT v4-HT v4-noHT v4-csc-HT v4-csc_stallfix-HT v4-csc_tim-HT v4-csc_vruntime-HT Amean 1 1.43 ( 0.00%) 1.17 * 18.15%* 1.15 * 19.64%* 1.15 * 19.44%* 1.16 * 19.14%* 1.17 * 18.34%* 1.16 * 18.94%* 1.16 * 18.94%* Amean 3 1.43 ( 0.00%) 1.17 * 18.33%* 1.17 * 18.73%* 1.15 * 19.52%* 1.15 * 19.52%* 1.19 * 16.93%* 1.16 * 19.12%* 1.16 * 19.32%* Amean 5 1.43 ( 0.00%) 1.18 * 17.45%* 1.15 * 19.44%* 1.15 * 19.54%* 1.17 * 18.15%* 1.18 * 17.55%* 1.15 * 19.44%* 1.16 * 19.04%* Amean 7 1.43 ( 0.00%) 1.18 * 17.53%* 1.16 * 19.32%* 1.15 * 19.72%* 1.17 * 18.33%* 1.17 * 18.13%* 1.16 * 18.92%* 1.15 * 19.62%* Amean 8 1.43 ( 0.00%) 1.17 * 18.46%* 1.16 * 19.16%* 1.16 * 18.96%* 1.17 * 18.46%* 1.18 * 17.86%* 1.15 * 19.36%* 1.16 * 19.06%* Stddev 1 0.00 ( 0.00%) 0.00 ( 0.00%) 0.00 ( 22.54%) 0.01 ( -9.54%) 0.01 (-119.09%) 0.01 ( -67.33%) 0.01 (-149.00%) 0.01 ( -84.39%) Stddev 3 0.01 ( 0.00%) 0.01 ( 12.29%) 0.02 (-105.69%) 0.01 ( 0.00%) 0.01 ( 0.00%) 0.05 (-515.82%) 0.01 ( -27.10%) 0.01 ( -41.42%) Stddev 5 0.00 ( 0.00%) 0.04 (-700.00%) 0.01 ( -61.25%) 0.01 ( -54.92%) 0.04 (-717.31%) 0.01 ( -84.39%) 0.01 ( -61.25%) 0.01 ( -18.32%) Stddev 7 0.01 ( 0.00%) 0.04 (-390.68%) 0.01 ( 3.92%) 0.00 ( 51.96%) 0.04 (-366.58%) 0.01 ( 0.00%) 0.02 (-151.15%) 0.01 ( 3.92%) Stddev 8 0.00 ( 0.00%) 0.00 ( -29.10%) 0.01 (-151.66%) 0.02 (-383.05%) 0.05 (-1100.00%) 0.01 (-108.17%) 0.01 ( -41.42%) 0.01 (-138.05%) v v VMx2 VMx2 VMx2 VMx2 VMx2 VMx2 VMx2-HT VMx2-noHT HT noHT csc-HT csc_stallfix-HT csc_tim-HT csc_vruntime-HT Amean 1 1.16 ( 0.00%) 1.22 * -5.80%* 1.54 * -32.84%* 1.22 * -5.31%* 2.83 (-144.32%) 1.35 * -16.42%* 1.69 * -46.30%* 1.35 * -16.91%* Amean 3 1.16 ( 0.00%) 1.24 * -6.90%* 1.56 * -34.11%* 1.24 * -6.53%* 1.89 * -63.05%* 1.95 * -68.35%* 1.67 * -43.84%* 1.33 * -14.41%* Amean 5 1.17 ( 0.00%) 1.21 * -3.79%* 1.52 * -30.48%* 1.23 * -5.75%* 1.43 * -22.89%* 1.85 ( -58.51%) 1.71 * -46.88%* 1.35 * -15.91%* Amean 7 1.15 ( 0.00%) 1.23 * -6.81%* 1.54 * -33.29%* 1.24 * -7.05%* 1.68 * -45.79%* 1.39 * -20.79%* 2.09 * -80.69%* 1.30 * -12.62%* Amean 12 1.16 ( 0.00%) 1.25 * -7.25%* 1.69 * -45.09%* 1.22 * -5.28%* 1.72 * -47.54%* 1.52 * -31.08%* 2.08 * -78.87%* 1.32 * -13.14%* Amean 16 1.16 ( 0.00%) 1.23 * -6.14%* 1.68 * -44.23%* 1.22 * -4.67%* 1.80 * -54.91%* 1.37 * -17.44%* 2.18 * -87.10%* 1.28 * -9.95%* Stddev 1 0.01 ( 0.00%) 0.05 (-569.58%) 0.14 (-1693.97%) 0.02 (-169.26%) 3.19 (-42121.82%) 0.25 (-3271.57%) 0.26 (-3362.06%) 0.09 (-1072.60%) Stddev 3 0.01 ( 0.00%) 0.06 (-664.85%) 0.06 (-630.95%) 0.03 (-259.56%) 0.84 (-10177.51%) 0.98 (-11852.56%) 0.45 (-5404.28%) 0.08 (-845.29%) Stddev 5 0.00 ( 0.00%) 0.02 (-393.96%) 0.17 (-3371.31%) 0.07 (-1423.81%) 0.32 (-6361.11%) 1.04 (-21129.08%) 0.22 (-4383.53%) 0.06 (-1033.14%) Stddev 7 0.01 ( 0.00%) 0.07 (-1234.79%) 0.20 (-3727.10%) 0.08 (-1483.25%) 0.57 (-10594.70%) 0.19 (-3455.98%) 0.30 (-5454.88%) 0.08 (-1400.56%) Stddev 12 0.00 ( 0.00%) 0.08 (-1641.84%) 0.16 (-3078.68%) 0.03 (-524.50%) 0.50 (-10161.87%) 0.08 (-1634.36%) 0.32 (-6423.80%) 0.07 (-1232.67%) Stddev 16 0.00 ( 0.00%) 0.05 (-996.36%) 0.20 (-3958.82%) 0.06 (-1045.43%) 0.60 (-12116.06%) 0.23 (-4642.99%) 0.23 (-4594.04%) 0.05 (-842.34%) This is all quite bizarre. Judging from these numbers, the benchmark seems to be no sensitive to HT at all (while, e.g., sysbenchcpu was), when on baremetal. In VMs, at least in most cases, things are significantly *faster* with HT off. Which I know is something that can happen, I just was not expecting it from this workload. Also, core scheduling is a total disaster on baremetal. And its behavior in VM is an anti-pattern too. So, I guess I'll go trying to see if I did something wrong when configuring or running this particular benchmark. If that is not the case, then core scheduling has a serious issue when dealing with threads instead than with processes, I would say.