From 6cf6da0c17510e9fc5b057530506f83114429b87 Mon Sep 17 00:00:00 2001 From: Rene Schwietzke Date: Tue, 23 Jan 2024 18:21:36 +0100 Subject: [PATCH] Added environment docs (#555) * Create ENVIRONMENT.md * More intel added --- ENVIRONMENT.md | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 ENVIRONMENT.md diff --git a/ENVIRONMENT.md b/ENVIRONMENT.md new file mode 100644 index 0000000..5df4e69 --- /dev/null +++ b/ENVIRONMENT.md @@ -0,0 +1,92 @@ +# Environment +This file just contains some intel about the environment in use and what has been done to get it into that state. + +## Machine Type + +* Hetzner AX161, Dedicated Hosted Hardware +* CPU: AMD EPYC 7502P 32 cores / 64 threads @ 2.5 GHz +* Memory: 128 GB ECC DDR4 RAM +* 2x SAMSUNG MZQL2960HCJR-00A07, 1 TB, Software RAID-1 +* CentOS 9, Linux 5.14.0-378.el9.x86_64 + +## Configuration + +* SMT off +* Turbo Boost Off +* Filesystem EXT4 + +## Details + +### CPU +``` +$ cat /proc/cpuinfo +processor : 0 +vendor_id : AuthenticAMD +cpu family : 23 +model : 49 +model name : AMD EPYC 7502P 32-Core Processor +stepping : 0 +microcode : 0x8301055 +cpu MHz : 2500.000 +cache size : 512 KB +physical id : 0 +siblings : 32 +core id : 0 +cpu cores : 32 +apicid : 0 +initial apicid : 0 +fpu : yes +fpu_exception : yes +cpuid level : 16 +wp : yes +flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sme sev sev_es +bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb +bogomips : 4990.70 +TLB size : 3072 4K pages +clflush size : 64 +cache_alignment : 64 +address sizes : 43 bits physical, 48 bits virtual +power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14] +... more for all other cores +``` + +## Setup + +### Turn SMT off +Disable during boot via boot-param, able to switch it on later again, if needed. + +Add `nosmt` to grub boot config in `/etc/default/grub` + +``` +# Added nosmt to command line +GRUB_CMDLINE_LINUX="biosdevname=0 crashkernel=auto rd.auto=1 consoleblank=0 nosmt" +``` + +Update boot config: +``` +sudo grub2-mkconfig -o /boot/grub2/grub.cfg +``` + +### Turbo Off +Using the legacy `/etc/rc.local` concept to change things during boot: + +``` +# Turn SMT off via software as well, already got nosmt in grub +echo off > /sys/devices/system/cpu/smt/control + +# Turn off turbo boost +echo 0 |tee /sys/devices/system/cpu/cpufreq/boost +``` +### Reduce Swapping +Reduce from default 60 to 10% memory pressure by adding `vm.swappiness = 10` to `/etc/sysctl.conf`. + +## Verify +Check after boot if all settings have been applied. Can also be used to control these during runtime. + +* SMT off: `cat /sys/devices/system/cpu/smt/active` must be 0 +* SWAP: `cat /proc/sys/vm/swappiness` must be 10 +* Turbo off: `cat /sys/devices/system/cpu/cpufreq/boost` must be 0 + + + +