小米路由器Openwrt固件修改代码超频至1100MHZ 推荐4.14内核，v2瑞性能是最好的，比新内核5.4强40%更换内核方法：打开LEDE目录/target/linux/ramips/MakefileKERNEL_PATCHVER:=4.14KERNEL_TESTING_PATCHVER:=4.14Lean的内核4.14的源码包下载在openwrt目录，设置在lede\target\linux\ramips\patches-4.14\102-mt7621-fix-cpu-clk-add-clkdev.patch文件，通过设置CPU频率寄存器，可以提升MT7621的频率修改一: 第68行，即下方第4行高亮代码#define MT7621_GPIO_MODE_UART1 1 #define MT7621_GPIO_MODE_I2C 2 #define MT7621_GPIO_MODE_UART3_MASK 0x3 @@ -113,49 +113,93 @@ static struct rt2880_pmx_group mt7621_pi { 0 } };修改二，第113和156-160行+void __init ralink_clk_init(void) +{ + u32 syscfg, xtal_sel, clkcfg, clk_sel, curclk, ffiv, ffrac; + u32 pll, prediv, fbdiv; // 下面一行，后面加了 i + u32 xtal_clk, cpu_clk, bus_clk,i; + const static u32 prediv_tbl[] = {0, 1, 2, 2}; + + syscfg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0); + xtal_sel = (syscfg >> XTAL_MODE_SEL_SHIFT) & XTAL_MODE_SEL_MASK; + + clkcfg = rt_sysc_r32(SYSC_REG_CLKCFG0); + clk_sel = (clkcfg >> CPU_CLK_SEL_SHIFT) & CPU_CLK_SEL_MASK; + + curclk = rt_sysc_r32(SYSC_REG_CUR_CLK_STS); + ffiv = (curclk >> CUR_CPU_FDIV_SHIFT) & CUR_CPU_FDIV_MASK; + ffrac = (curclk >> CUR_CPU_FFRAC_SHIFT) & CUR_CPU_FFRAC_MASK; + + if (xtal_sel <= 2) + xtal_clk = 20 * 1000 * 1000; + else if (xtal_sel <= 5) + xtal_clk = 40 * 1000 * 1000; + else + xtal_clk = 25 * 1000 * 1000; switch (clk_sel) { case 0: - clk_sts = rt_sysc_r32(SYSC_REG_CUR_CLK_STS); - cpu_fdiv = ((clk_sts >> 8) & 0x1F); - cpu_ffrac = (clk_sts & 0x1F); - cpu_clk = (500 * cpu_ffrac / cpu_fdiv) * 1000 * 1000; + cpu_clk = 500 * 1000 * 1000; break; - case 1: - fbdiv = ((rt_sysc_r32(0x648) >> 4) & 0x7F) + 1; - syscfg = rt_sysc_r32(SYSC_REG_SYSCFG); - xtal_mode = (syscfg >> 6) & 0x7; - if (xtal_mode >= 6) { - /* 25Mhz Xtal */ - cpu_clk = 25 * fbdiv * 1000 * 1000; - } else if (xtal_mode >= 3) { - /* 40Mhz Xtal */ - cpu_clk = 40 * fbdiv * 1000 * 1000; - } else { - /* 20Mhz Xtal */ - cpu_clk = 20 * fbdiv * 1000 * 1000; - } + pll = rt_memc_r32(MEMC_REG_CPU_PLL); // 加了下面4行 + pll &= ~(0x7ff); + pll |= (0x362); + rt_memc_w32(pll,MEMC_REG_CPU_PLL); + for(i=0;i<1024;i++); + fbdiv = (pll >> CPU_PLL_FBDIV_SHIFT) & CPU_PLL_FBDIV_MASK; + prediv = (pll >> CPU_PLL_PREDIV_SHIFT) & CPU_PLL_PREDIV_MASK; + cpu_clk = ((fbdiv + 1) * xtal_clk) >> prediv_tbl[prediv]; break;将原代码改为上面红色字体三行代码，其中"0x362"这个位置的值，对应的是1100Mhz的频率设置频率设置值的换算如下，0x362 =1100Mhz/20Mhz -1 = 5454*16+2 = 866866转为十六进制就是0x362相应的，1000Mhz--0x3121200Mhz--0x3B2保存文件,重新编译，之前最好是能编译成功一次make clean（一定要这个清除命令否则改动不会编译进去）make -j1 V=s （如果之前已经成功编译过，可以用多线程编译）openssl加解密性能测试进入ssh，输入下面命令测试openssl speed -evp aes-128-gcm测试结果Openwrt超频1100Mhz，以1024字节为例是8887k 880Mhz1100MhzOpenwrt7112k8887kPandavan6217k7768kaes-128-gcm测试成绩从原来的6209k/s提升到7768k/s，性能提升25%Openwrt用的4.14内核，效能比Padavan3.4内核好很多油管，Trojan能跑到50mpbs，强烈推荐MT7621跑trojan油管性能测试对比 880Mhz1100MhzOpenwrt18mbps22mbpsPandavan13mbps16mbps此方法不光对小米路由AC2100有效，对MT7621的路由器应该都有效。