XMR-stak Benchmarking results XPS 13 9365 running Ubuntu 18.04

Here the latest benchmarking results mining monero7 with xmr-stak 2.4.2.

My configuration:

- Laptop Dell XPS 13 9365, CPU i7-7Y75@1.3 Ghz, turbo mode up to 3.6 Ghz.
- Ubuntu 18.04 (kernel 4.16.3)
- xmr-stak 2.4.2 with cpu configuration by default (1 thread per core)



Result 1
- Governor: powersave
- Scaling settings: High performance (min cpu speed: 50%, max: 100%)

[2018-04-22 18:04:25] : Mining coin: monero7
!!!! Doing only a benchmark and exiting. To mine, remove the '--benchmark' option. !!!!
[2018-04-22 18:04:25] : Prepare benchmark for block version 0
[2018-04-22 18:04:25] : Starting 1x thread, affinity: 0.
[2018-04-22 18:04:25] : hwloc: memory pinned
[2018-04-22 18:04:25] : Starting 1x thread, affinity: 1.
[2018-04-22 18:04:25] : MEMORY ALLOC FAILED: mmap failed
[2018-04-22 18:04:25] : hwloc: memory pinned
[2018-04-22 18:04:25] : Wait 30 sec until all backends are initialized
[2018-04-22 18:04:25] : MEMORY ALLOC FAILED: mmap failed
[2018-04-22 18:04:55] : Start a 60 second benchmark...
[2018-04-22 18:05:55] : Benchmark Thread 0 cpu: 25.7 H/S
[2018-04-22 18:05:55] : Benchmark Thread 1 cpu: 26.7 H/S
[2018-04-22 18:05:55] : Benchmark Total: 52.4 H/S

Result 2 without huge pages enabled.

- Governor: performance
- Scaling settings: High performance (min cpu speed: 50%, max: 100%)

[2018-04-22 16:52:56] : Mining coin: monero7
!!!! Doing only a benchmark and exiting. To mine, remove the '--benchmark' option. !!!!
[2018-04-22 16:52:56] : Prepare benchmark for block version 0
[2018-04-22 16:52:56] : Starting 1x thread, affinity: 0.
[2018-04-22 16:52:56] : hwloc: memory pinned
[2018-04-22 16:52:56] : Starting 1x thread, affinity: 1.
[2018-04-22 16:52:56] : MEMORY ALLOC FAILED: mmap failed
[2018-04-22 16:52:56] : hwloc: memory pinned
[2018-04-22 16:52:56] : Wait 30 sec until all backends are initialized
[2018-04-22 16:52:56] : MEMORY ALLOC FAILED: mmap failed
[2018-04-22 16:53:26] : Start a 60 second benchmark...
[2018-04-22 16:54:26] : Benchmark Thread 0 cpu: 29.3 H/S
[2018-04-22 16:54:26] : Benchmark Thread 1 cpu: 27.4 H/S
[2018-04-22 16:54:26] : Benchmark Total: 56.6 H/S

Result 3, after enabling huge pages (using sudo sysctl -w vm.nr_hugepages=128)

[2018-04-22 17:22:43] : Mining coin: monero7

!!!! Doing only a benchmark and exiting. To mine, remove the '--benchmark' option. !!!!

[2018-04-22 17:22:43] : Prepare benchmark for block version 0

[2018-04-22 17:22:43] : Starting 1x thread, affinity: 0.

[2018-04-22 17:22:43] : hwloc: memory pinned

[2018-04-22 17:22:43] : Starting 1x thread, affinity: 1.

[2018-04-22 17:22:43] : hwloc: memory pinned

[2018-04-22 17:22:43] : Wait 30 sec until all backends are initialized

[2018-04-22 17:23:13] : Start a 60 second benchmark...

[2018-04-22 17:24:13] : Benchmark Thread 0 cpu: 40.7 H/S

[2018-04-22 17:24:13] : Benchmark Thread 1 cpu: 40.7 H/S

[2018-04-22 17:24:13] : Benchmark Total: 81.4 H/S

(Average is around 80 after running the benchmark 5 times)

It seems that 128 is the best size, I had best results with 128 than 64 or 256. 

The increase in performance due to hugepages is around 30%. 

Since this cpu doesn't have fans, the performance might not be maintained if the cpu speed is throttled due to increase in core's temperatures.  

I hope this information is useful to XPS 13 owners who want to test mining softwares in Ubuntu.