Add Linux instruction for enabling huge pages

[Artoria2e5]

No description provided.

[trasherdk]

Please notice. HugePage support has to be enabled in the kernel.
In Slackware 14.2 it's not.
To enable, a config and compile from source is required.

[xmrig]

https://xmrig.com/docs/miner/hugepages

[trasherdk]

None of the suggestions in the linked page help a stock Slackware installation.

The path in the enable_1gb_pages.sh script, /sys/devices/system/node/node* does not exist on Slackware :)

Unless recompiling the kernel, enabling hugepages, the path /proc/sys/vm/nr_hugepages does not exist.

# cat /proc/sys/vm/nr_hugepages
4
# echo 1280 > /proc/sys/vm/nr_hugepages
# cat /proc/sys/vm/nr_hugepages        
1024
# sysctl -w vm.nr_hugepages=1280
vm.nr_hugepages = 1280
# sysctl -n vm.nr_hugepages     
1025
# cat /proc/sys/vm/nr_hugepages
1025

Running xmrig as root, with the msr stuff in place.

 * ABOUT        XMRig/6.3.1 gcc/5.5.0
 * LIBS         libuv/1.35.0 OpenSSL/1.0.2u hwloc/2.1.0rc2-git
 * HUGE PAGES   supported
 * 1GB PAGES    unavailable
 * CPU          Intel(R) Xeon(R) CPU E3-1230 v5 @ 3.40GHz (1) x64 AES
                L2:1.0 MB L3:32.0 MB 4C/4T NUMA:1
 * MEMORY       7.2/7.8 GB (93%)
 * DONATE       1%
 * ASSEMBLY     auto:intel
 * POOL #1      localhost:8004 coin monero self-select localhost:38081
 * COMMANDS     hashrate, pause, resume, results, connection
 * OPENCL       disabled
 * CUDA         disabled
[2020-08-01 11:35:42.717]  net      use pool localhost:8004  127.0.0.1
[2020-08-01 11:39:22.380]  net      new job from localhost:8004 diff 1000 algo rx/0 height 634999
[2020-08-01 11:39:22.380]  cpu      use argon2 implementation AVX2
[2020-08-01 11:39:22.385]  msr      register values for "intel" preset has been set successfully (5 ms)
[2020-08-01 11:39:22.385]  randomx  init dataset algo rx/0 (4 threads) seed 3e01ec441ac88b75...
[2020-08-01 11:39:22.385]  randomx  failed to allocate RandomX dataset using 1GB pages
[2020-08-01 11:39:22.398]  randomx  allocated 2336 MB (2080+256) huge pages 11% 128/1168 +JIT (13 ms)
[2020-08-01 11:39:36.842]  randomx  dataset ready (14443 ms)
[2020-08-01 11:39:36.954]  cpu      use profile  rx  (2 threads) scratchpad 2048 KB
[2020-08-01 11:39:36.977]  cpu      READY threads 2/2 (2) huge pages 100% 2/2 memory 4096 KB (23 ms)
[2020-08-01 11:40:00.436]  cpu      accepted (1/0) diff 1000 (22983 ms)
[2020-08-01 11:40:06.945]  miner    speed 10s/60s/15m 458.5 n/a n/a H/s max 482.8 H/s
[2020-08-01 11:40:36.951]  miner    speed 10s/60s/15m 435.0 n/a n/a H/s max 482.8 H/s
[2020-08-01 11:41:06.986]  miner    speed 10s/60s/15m 435.4 435.5 n/a H/s max 482.8 H/s

Compared to running same config as non-privileged user, without the msr stuff.

 * ABOUT        XMRig/6.3.1 gcc/5.5.0
 * LIBS         libuv/1.35.0 OpenSSL/1.0.2u hwloc/2.1.0rc2-git
 * HUGE PAGES   supported
 * 1GB PAGES    unavailable
 * CPU          Intel(R) Xeon(R) CPU E3-1230 v5 @ 3.40GHz (1) x64 AES
                L2:1.0 MB L3:32.0 MB 4C/4T NUMA:1
 * MEMORY       5.6/7.8 GB (72%)
 * DONATE       1%
 * ASSEMBLY     auto:intel
 * POOL #1      localhost:8004 coin monero self-select localhost:38081
 * COMMANDS     hashrate, pause, resume, results, connection
 * OPENCL       disabled
 * CUDA         disabled
[2020-08-01 11:43:23.339]  net      use pool localhost:8004  127.0.0.1
[2020-08-01 11:43:23.417]  net      new job from localhost:8004 diff 1000 algo rx/0 height 635000
[2020-08-01 11:43:23.417]  cpu      use argon2 implementation AVX2
[2020-08-01 11:43:23.662]  msr      cannot read MSR 0x000001a4
[2020-08-01 11:43:23.662]  msr      cannot set MSR 0x000001a4 to 0x0000000f
[2020-08-01 11:43:23.662]  msr      FAILED TO APPLY MSR MOD, HASHRATE WILL BE LOW
[2020-08-01 11:43:23.663]  randomx  init dataset algo rx/0 (4 threads) seed 3e01ec441ac88b75...
[2020-08-01 11:43:23.663]  randomx  failed to allocate RandomX dataset using 1GB pages
[2020-08-01 11:43:23.678]  randomx  allocated 2336 MB (2080+256) huge pages 11% 128/1168 +JIT (15 ms)
[2020-08-01 11:43:32.411]  randomx  dataset ready (8734 ms)
[2020-08-01 11:43:32.411]  cpu      use profile  rx  (2 threads) scratchpad 2048 KB
[2020-08-01 11:43:32.435]  cpu      READY threads 2/2 (2) huge pages 100% 2/2 memory 4096 KB (23 ms)
[2020-08-01 11:43:51.088]  cpu      accepted (1/0) diff 1000 (17700 ms)
[2020-08-01 11:44:02.439]  miner    speed 10s/60s/15m 630.5 n/a n/a H/s max 631.4 H/s
[2020-08-01 11:44:32.458]  miner    speed 10s/60s/15m 631.3 n/a n/a H/s max 631.4 H/s