都晓得内网提早低，到底有多低呢？数量级是多少？多少毫秒呢？

咱们来定量的看看内网的提早。

测试设施如下：

测试路由器：小米 AX1800
测试 PC1：联想 YOGA14s，应用 5G wifi 连贯到路由器，ip 地址为 192.168.31.127
测试 PC2：AMD 5700G 平台，应用 6 类网线连贯到路由器，ip 地址为 192.168.31.245
（被）测试服务器：树莓派 4B 4GB，应用 5 类线连贯到路由器，ip 地址为 192.168.31.203

应用无线网 ping 服务器

测试 PC1：联想 YOGA14s ———-ping——->（被）测试服务器：树莓派 4B 4GB

csy@Yoga14S-yjc:~$ ping 192.168.31.203
PING 192.168.31.203 (192.168.31.203) 56(84) bytes of data.
64 bytes from 192.168.31.203: icmp_seq=1 ttl=63 time=5.40 ms
64 bytes from 192.168.31.203: icmp_seq=2 ttl=63 time=2.96 ms
64 bytes from 192.168.31.203: icmp_seq=3 ttl=63 time=2.80 ms
64 bytes from 192.168.31.203: icmp_seq=4 ttl=63 time=3.44 ms
64 bytes from 192.168.31.203: icmp_seq=5 ttl=63 time=3.38 ms
64 bytes from 192.168.31.203: icmp_seq=6 ttl=63 time=3.31 ms
^C
--- 192.168.31.203 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5009ms
rtt min/avg/max/mdev = 2.804/3.547/5.395/0.857 ms

应用网线 ping 服务器

测试 PC2：AMD 5700G 平台 ———-ping——->（被）测试服务器：树莓派 4B 4GB

╭─bot@amd-5700G ~  
╰─➤  ping 192.168.31.203
PING 192.168.31.203 (192.168.31.203) 56(84) bytes of data.
64 比特，来自 192.168.31.203: icmp_seq=1 ttl=64 工夫 =0.253 毫秒
64 比特，来自 192.168.31.203: icmp_seq=2 ttl=64 工夫 =0.669 毫秒
64 比特，来自 192.168.31.203: icmp_seq=3 ttl=64 工夫 =0.641 毫秒
64 比特，来自 192.168.31.203: icmp_seq=4 ttl=64 工夫 =0.235 毫秒
64 比特，来自 192.168.31.203: icmp_seq=5 ttl=64 工夫 =0.596 毫秒
64 比特，来自 192.168.31.203: icmp_seq=6 ttl=64 工夫 =0.210 毫秒
64 比特，来自 192.168.31.203: icmp_seq=7 ttl=64 工夫 =0.612 毫秒
^C
--- 192.168.31.203 ping 统计 ---
已发送 7 个包，已接管 7 个包, 0% 包失落, 耗时 6126 毫秒
rtt min/avg/max/mdev = 0.210/0.459/0.669/0.197 ms

论断：

内网通信的提早:
应用 wifi 的话，提早在 1-10ms 的程度
应用 网线的话，提早在 0.1-1ms 的程度，足足升高了一个数量级。

有此，如果对网络提早比拟敏感的话，例如一些网络 IO 密集的常见下，倡议应用网线吧。

扩大：常见 DNS 提早

引入一些参考，通过互联网拜访常见的 DNS 服务器

自己坐标杭州

腾讯 DNS

IP：119.29.29.29

csy@Yoga14S-yjc:~$ ping 119.29.29.29
PING 119.29.29.29 (119.29.29.29) 56(84) bytes of data.
64 bytes from 119.29.29.29: icmp_seq=1 ttl=34 time=35.5 ms
64 bytes from 119.29.29.29: icmp_seq=2 ttl=34 time=35.6 ms
64 bytes from 119.29.29.29: icmp_seq=3 ttl=34 time=35.8 ms
64 bytes from 119.29.29.29: icmp_seq=4 ttl=34 time=35.7 ms
64 bytes from 119.29.29.29: icmp_seq=5 ttl=34 time=35.1 ms
64 bytes from 119.29.29.29: icmp_seq=6 ttl=34 time=35.5 ms
^C
--- 119.29.29.29 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5008ms
rtt min/avg/max/mdev = 35.104/35.525/35.760/0.210 ms

备用：182.254.116.116

阿里 DNS

IP：223.5.5.5

csy@Yoga14S-yjc:~$ ping 223.5.5.5
PING 223.5.5.5 (223.5.5.5) 56(84) bytes of data.
64 bytes from 223.5.5.5: icmp_seq=1 ttl=116 time=9.32 ms
64 bytes from 223.5.5.5: icmp_seq=2 ttl=116 time=9.73 ms
64 bytes from 223.5.5.5: icmp_seq=3 ttl=116 time=9.68 ms
64 bytes from 223.5.5.5: icmp_seq=4 ttl=116 time=9.60 ms
64 bytes from 223.5.5.5: icmp_seq=5 ttl=116 time=9.22 ms
64 bytes from 223.5.5.5: icmp_seq=6 ttl=116 time=9.42 ms
64 bytes from 223.5.5.5: icmp_seq=7 ttl=116 time=9.72 ms
64 bytes from 223.5.5.5: icmp_seq=8 ttl=116 time=8.39 ms
64 bytes from 223.5.5.5: icmp_seq=9 ttl=116 time=9.08 ms
64 bytes from 223.5.5.5: icmp_seq=10 ttl=116 time=9.98 ms
^C
--- 223.5.5.5 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9016ms
rtt min/avg/max/mdev = 8.393/9.414/9.976/0.425 ms

备用：223.6.6.6

百度 DNS

IP:180.76.76.76

csy@Yoga14S-yjc:~$ ping 180.76.76.76
PING 180.76.76.76 (180.76.76.76) 56(84) bytes of data.
64 bytes from 180.76.76.76: icmp_seq=1 ttl=49 time=14.8 ms
64 bytes from 180.76.76.76: icmp_seq=2 ttl=49 time=14.1 ms
64 bytes from 180.76.76.76: icmp_seq=3 ttl=49 time=13.8 ms
64 bytes from 180.76.76.76: icmp_seq=4 ttl=49 time=13.8 ms
64 bytes from 180.76.76.76: icmp_seq=5 ttl=49 time=13.9 ms
64 bytes from 180.76.76.76: icmp_seq=6 ttl=49 time=12.7 ms
64 bytes from 180.76.76.76: icmp_seq=7 ttl=49 time=14.3 ms
^C
--- 180.76.76.76 ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6011ms
rtt min/avg/max/mdev = 12.674/13.915/14.820/0.611 ms

简要总结计算机各种延时（寄存器、cache、内存、磁盘）

简要总结计算机各种延时（寄存器、cache、内存、磁盘）