如何快速知道 CPUID 的含义
intel :
Intel SDM Table 1-17. Information Returned by CPUID Instruction
amd : 似乎没有一个表格，文档也不是完全自洽的，例如
Fn8000_0022_EBX[LbrStackSize] ，其中的 LbrStackSize 的定义就是找不到的。
TOPO 相关的
🧀 diff 13900k-core1.cpuid 13900k-core0.cpuid
3c3
< 0x00000001 0x00: eax=0x000b0671 ebx=0x01800800 ecx=0x7ffafbff edx=0xbfebfbff
---
> 0x00000001 0x00: eax=0x000b0671 ebx=0x00800800 ecx=0x7ffafbff edx=0xbfebfbff
19,21c19,21
< 0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100 edx=0x00000001
< 0x0000000b 0x01: eax=0x00000007 ebx=0x00000020 ecx=0x00000201 edx=0x00000001
< 0x0000000b 0x02: eax=0x00000000 ebx=0x00000000 ecx=0x00000002 edx=0x00000001
---
> 0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100 edx=0x00000000
> 0x0000000b 0x01: eax=0x00000007 ebx=0x00000020 ecx=0x00000201 edx=0x00000000
> 0x0000000b 0x02: eax=0x00000000 ebx=0x00000000 ecx=0x00000002 edx=0x00000000
61,63c61,63
< 0x0000001f 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100 edx=0x00000001
< 0x0000001f 0x01: eax=0x00000007 ebx=0x00000020 ecx=0x00000201 edx=0x00000001
< 0x0000001f 0x02: eax=0x00000000 ebx=0x00000000 ecx=0x00000002 edx=0x00000001
---
> 0x0000001f 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100 edx=0x00000000
> 0x0000001f 0x01: eax=0x00000007 ebx=0x00000020 ecx=0x00000201 edx=0x00000000
> 0x0000001f 0x02: eax=0x00000000 ebx=0x00000000 ecx=0x00000002 edx=0x00000000
第一个 logical process
参考 0x0b 和 0x1f 都是展示拓扑的: https://www.felixcloutier.com/x86/cpuid
所以，最后是执行一个来测试:
cgexec --sticky -g cpu,memory,cpuset:/ taskset -ac 1 cpuid -r -1
diff --git a/docs/kernel/cpuinfo/zhaoxin/182 b/docs/kernel/cpuinfo/zhaoxin/182
index d29be4b2b454..16d72f3e34cb 100644
--- a/docs/kernel/cpuinfo/zhaoxin/182
+++ b/docs/kernel/cpuinfo/zhaoxin/182
@@ -57,8 +57,8 @@
0x80000008 0x00: eax=0x0000302e ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80860000 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0xc0000000 0x00: eax=0xc0000005 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
- 0xc0000001 0x00: eax=0x000507bb ebx=0x00000000 ecx=0x00000000 edx=0x1ec33dff
+ 0xc0000001 0x00: eax=0x000507bb ebx=0x00000000 ecx=0x00000000 edx=0x1ec13dff
0xc0000002 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0xc0000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
- 0xc0000004 0x00: eax=0x0000002d ebx=0x100029c7 ecx=0x107832ce edx=0x00000000
+ 0xc0000004 0x00: eax=0x00000044 ebx=0x100028af ecx=0x107832ce edx=0x00000000
0xc0000005 0x00: eax=0x00000082 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
CPU 型号
** 67.88 服务器
cgexec –sticky -g cpu,memory,cpuset:/ -ac 1 cpuid -r -1
CPU: 0x00000001 0x00: eax=0x00050657 ebx=0x12200800 ecx=0x7ffefbff edx=0xbfebfbff
🧀 cpuid -l 1 -1
CPU:
version information (1/eax):
processor type = primary processor (0)
family = 0x6 (6)
model = 0x5 (5)
stepping id = 0x7 (7)
extended family = 0x0 (0)
extended model = 0x5 (5)
(family synth) = 0x6 (6)
(model synth) = 0x55 (85)
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 46 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 64
On-line CPU(s) list: 0-63
Vendor ID: GenuineIntel
Model name: Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz
CPU family: 6
Model: 85
Thread(s) per core: 2
Core(s) per socket: 16
Socket(s): 2
Stepping: 7
** 某一个机器
cpuid -r -1
CPU: 0x00000001 0x00: eax=0x000806f8 ebx=0x48400800 ecx=0x7ffefbff edx=0xbfebfbff
也就是 6 8f 8
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 48
On-line CPU(s) list: 0-47
Thread(s) per core: 2
Core(s) per socket: 12
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 143
Model name: INTEL(R) XEON(R) SILVER 4510
** 扩展内容
https://en.wikichip.org/wiki/intel/cpuid#Big_Cores_.28Server.29
从这里看
Emerald Rapids (2023) Golden Cove 0 0x6 0xC 0xF Family 6 Model 207
Sapphire Rapids (2023) Golden Cove SP 0 0x6 0x8 0xF Family 6 Model 143
哦，原来 intel 的 4 代和 5 代是一个模糊的概念: https://www.intel.com/content/www/us/en/products/sku/236637/intel-xeon-silver-4510-processor-30m-cache-2-40-ghz/specifications.html
Product Collection 5th Gen Intel® Xeon® Scalable Processors
Code Name Products formerly Sapphire Rapids
从这里看，SPR 就是 4 代: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20250812
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