修改MTU对网速的影响

梦里梦外; 2022-05-31 06:39 765阅读 0赞

默认的以太网MTU为1500

![这里写图片描述][70]

然后用speedtest工具测试上传和下载的网速  
![这里写图片描述][70 1]

分别修改MTU值为1360和2000，然后分别测试上传和下载速度  
![这里写图片描述][70 2]

这里，我每个MTU测试了5组，得到数值如下表：

<table> 
 <thead> 
  <tr> 
   <th align="left">MTU</th> 
   <th align="right">download (M/s)</th> 
   <th align="center">upload (M/s)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">29.77</td> 
   <td align="center">48.62</td> 
  </tr> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">39.9</td> 
   <td align="center">22.82</td> 
  </tr> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">33.96</td> 
   <td align="center">28.69</td> 
  </tr> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">17.28</td> 
   <td align="center">32.38</td> 
  </tr> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">35.43</td> 
   <td align="center">38.81</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <thead> 
  <tr> 
   <th align="left">MTU</th> 
   <th align="right">download (M/s)</th> 
   <th align="center">upload (M/s)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">21.47</td> 
   <td align="center">22.61</td> 
  </tr> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">39.65</td> 
   <td align="center">45.75</td> 
  </tr> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">38.50</td> 
   <td align="center">50.50</td> 
  </tr> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">39.92</td> 
   <td align="center">50.67</td> 
  </tr> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">14.71</td> 
   <td align="center">48.72</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <thead> 
  <tr> 
   <th align="left">MTU</th> 
   <th align="right">download (M/s)</th> 
   <th align="center">upload (M/s)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">27.19</td> 
   <td align="center">48.94</td> 
  </tr> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">27.08</td> 
   <td align="center">27.25</td> 
  </tr> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">24.27</td> 
   <td align="center">50.56</td> 
  </tr> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">7.33</td> 
   <td align="center">13.02</td> 
  </tr> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">34.03</td> 
   <td align="center">49.36</td> 
  </tr> 
 </tbody> 
</table>

每组数据去掉一个最大值和最小值，得到平均下载和上传速度如下表

<table> 
 <thead> 
  <tr> 
   <th align="left">MTU</th> 
   <th align="right">download （M/s）</th> 
   <th align="center">upload (M/s)</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">1500</td> 
   <td align="right">33.05</td> 
   <td align="center">33.29</td> 
  </tr> 
  <tr> 
   <td align="left">1360</td> 
   <td align="right">33.21</td> 
   <td align="center">48.32</td> 
  </tr> 
  <tr> 
   <td align="left">2000</td> 
   <td align="right">26.18</td> 
   <td align="center">41.85</td> 
  </tr> 
 </tbody> 
</table>

结论：修改MTU的值会影响网速，且设置MTU值小于1500的时候网速较好（有待进一步考证）

[70]: /images/20220531/b236950f64b448219321db41f22a9202.png
[70 1]: /images/20220531/4786b98b043f47fb9242f5905283e913.png
[70 2]: /images/20220531/a4503d65d12c40198990f6f5636a6726.png