Turning Hyper-Threading back on and letting xmr-stak write a new default cpu.txt gives 8% increase in hash rate with a ~10% increase in power usage. Not as efficient but more H/s on dual Xeon E5-2670 bare metal on Debian 9.
3177.8 H/s 246 Watts
3423.0 H/s 276 Watts
3177.8 H/s 246 Watts
3423.0 H/s 276 Watts
Code:
HASHRATE REPORT - CPU
| ID | 10s | 60s | 15m | ID | 10s | 60s | 15m |
| 0 | 152.5 | 152.6 | 152.6 | 1 | 151.3 | 151.3 | 151.4 |
| 2 | 150.6 | 150.6 | 150.6 | 3 | 149.0 | 149.1 | 149.1 |
| 4 | 92.1 | 92.1 | 92.1 | 5 | 93.1 | 93.1 | 93.1 |
| 6 | 94.8 | 94.8 | 94.8 | 7 | 94.5 | 94.5 | 94.4 |
| 8 | 91.6 | 91.7 | 91.6 | 9 | 90.9 | 90.9 | 90.9 |
| 10 | 90.3 | 90.3 | 90.3 | 11 | 89.4 | 89.5 | 89.5 |
| 12 | 92.1 | 92.1 | 92.1 | 13 | 93.1 | 93.1 | 93.1 |
| 14 | 94.6 | 94.6 | 94.6 | 15 | 94.5 | 94.5 | 94.4 |
| 16 | 152.6 | 152.6 | 152.7 | 17 | 151.1 | 151.1 | 151.1 |
| 18 | 150.4 | 150.4 | 150.4 | 19 | 149.6 | 149.6 | 149.6 |
| 20 | 91.5 | 91.5 | 91.5 | 21 | 92.5 | 92.5 | 92.5 |
| 22 | 93.0 | 93.0 | 93.0 | 23 | 93.8 | 93.7 | 93.8 |
| 24 | 91.5 | 91.5 | 91.5 | 25 | 90.7 | 90.7 | 90.7 |
| 26 | 90.3 | 90.3 | 90.3 | 27 | 89.5 | 89.5 | 89.5 |
| 28 | 91.5 | 91.5 | 91.5 | 29 | 92.5 | 92.5 | 92.5 |
| 30 | 93.0 | 93.0 | 93.0 | 31 | 93.8 | 93.7 | 93.8 |
-----------------------------------------------------
Totals: 3421.6 3422.0 3421.9 H/s
Highest: 3423.0 H/s