diff --git a/study/kernel/00-DESCRIPTION/ARCH.md b/study/kernel/00-DESCRIPTION/ARCH.md
index e67d56c..637faf1 100644
--- a/study/kernel/00-DESCRIPTION/ARCH.md
+++ b/study/kernel/00-DESCRIPTION/ARCH.md
@@ -161,10 +161,18 @@ Intel Architecture Day 2021, 官宣了自己的服务于终端和桌面场景的
 | 时间  | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
 |:----:|:----:|:---:|:----:|:---------:|:----:|
 | 2021/06/10 | Anup Patel <anup.patel@wdc.com> | [RISC-V CPU Idle Support](https://patchwork.kernel.org/project/linux-riscv/cover/20210610052221.39958-1-anup.patel@wdc.com) | RISC-V高级核心本地中断(Advacned Core Local Interruptor-ACLINT) 支持 | v3 ☐ | [Patchwork v7,0/8](https://patchwork.kernel.org/project/linux-riscv/cover/20210830041729.237252-1-anup.patel@wdc.com) |
-
 | 2021/08/30 | Anup Patel <anup.patel@wdc.com> | [Linux RISC-V ACLINT Support](https://patchwork.kernel.org/project/linux-riscv/cover/20210830041729.237252-1-anup.patel@wdc.com) | RISC-V高级核心本地中断(Advacned Core Local Interruptor-ACLINT) 支持 | v3 ☐ | [Patchwork RFC,v3,00/11](https://patchwork.kernel.org/project/linux-riscv/cover/20210610052221.39958-1-anup.patel@wdc.com) |
 
 
+# 4 benchmark
+-------
+
+
+用于评价 CPU 性能指标的标准主要有三种: Dhrystone、MIPS、CoreMark.
+
+20 世纪 70-80 年代开始流行的几个性能测试标准, 它们分别是 Livermore、Whetstone、Linpack、Dhrystone, 这四个性能测试标准也被合称为 Classic Benchmark. 这个网址简单介绍了四大经典性能测试标准历史 http://www.roylongbottom.org.uk/classic.htm。
+
+
 
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