服务器性能调优再谈

INTEL平台¹

BIOS Settings

• Hyperthreading = Off

• Profile = Maximum Performance

OS Settings

• processor.max_cstate = 1

• intel_idle.max_cstate = 0

• iommu = pt

• mitigations = off

In the last few years, a family of new security vulnerabilities was discovered affecting many CPUs made by all major CPU makers. Sadly, patching these vulnerabilities had the side effect of a huge performance impact that can reach up to a ~%25 decrease in some workloads.

New CPUs (mostly the ones released after 2020) often do not suffer from such vulnerabilities nor from the highly performance-impacting patches to fix them. However, for a lot of older CPUs, your Linux system performance may be taking a considerable performance penalty to remain secure from such vulnerability exploits.²

• clear caches

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# 清除页面缓存:
echo 1 > /proc/sys/vm/drop_caches
# 清除目录项和索引节点缓存:
echo 2 > /proc/sys/vm/drop_caches
# 同时清除页面缓存、目录项和索引节点缓存:
echo 3 > /proc/sys/vm/drop_caches

• NUMA Balancing = 0

• randomize_va_space = 0

• THP = ON

• CPU Governor = Performance

AMD平台¹

BIOS Settings

• SMT = OFF

• NPS = 4

• Determinism = Power

OS Settings

• amd_iommu = ON

• iommu = pt

• mitigations = off

• clear caches

• NUMA balancing = 0

• THP = on

• CPU governor = Performance

• C2 states = disabled

极客湾

• 极客湾在B站发布的《256核512线程！史上最强CPU到底能做什么？》 12分30秒位置，写了AMD EPYC 9754的调优参数为，

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-SMT = OFF
NPS = 4
I0MMU = ON
mitigations = off
NUMA balancing = 0