我长期在网吧工作,对网络很关注,一开始用CISCO1721的路由器,感觉人少的时候还可以,但人一多就卡.后来改用Linux,用P4的机器装了 Gentoo Linux + iptables + squid,感觉比CISCO1721的路由器好了,但还是没有达到我的要求,我的要求是要做一个"极品的路由器",完全运行在内存上,不在硬盘上运行, 硬盘可有可无,可用光盘,闪盘代替,现在终于用LFS做了一个"嵌入式linux路由软件",用ramdisk(内存硬盘),即把Linux系统完全嵌入到内存中,而不依赖于任何其他硬盘。由于系统不工作在硬盘上，所以系统消除了由于机械驱动而导致的低效和不稳定的问题；因为系统运行于内存中，根文件系统和操作完全在CPU/RAM环境下，系统性能在速度和可靠性达到了最好.即有高档硬路由的嵌入式系统,又利用了台式机强大的性能,(硬件路由的CPU只有几百兆.内存还是SDRAM,但台式机已经是DDR,RUNBUS了),我认为这才是"网吧的极品路由器".性能很高,可以长时间不停运行(因为工作于 CPU/RAM环境下,没有硬盘.),又可以自由DIY,不论100M,1000M还是10000M的网卡都支持,原来用过iptables的都会用........自己很满意.
看是否在内存上运行:
/ # mount
/dev/root on / type ext2(ro)
none on /dev type devfs(rw)
proc on /proc type proc(rw,nodiratime)
运行结果显示:没有硬盘,只有内存盘.
看硬盘(其实是内存盘)占用情况:
/ # df -h
Filesystem Size Used Available Use% Mounted on
/dev/root 3.9M 2.6M 1.3M 67% /
运行结果显示:内存盘大小4M,root系统文件占用2.6M.
看内存使用情况:
/ # free
total used free shared buffers
Mem:513664 14300 499364 0 3964
Swap:0 0 0
Total:513664 14300 499364
运行结果显示:内存有512M,使用了14M,其中4M是系统盘,实际使用内存量:10M.
在嵌入式操作系统下运行:
/ # ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=6 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=7 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=8 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=9 ttl=64 time=0.0 ms
64 bytes from 127.0.0.1: icmp_seq=10 ttl=64 time=0.0 ms
--- 127.0.0.1 ping statistics ---
11 packets transmitted, 11 packets received, 0% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms
运行结果显示:又快又稳定.另外此嵌入式linux路由系统启动时间只要5秒左右.
对比开发机是同一台机器,linux FC4操作系统)
[root@localhost ~]# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.073 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.050 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.049 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.049 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.050 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=6 ttl=64 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=7 ttl=64 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=8 ttl=64 time=0.057 ms
--- 127.0.0.1 ping statistics ---
9 packets transmitted, 9 received, 0% packet loss, time 7998ms
rtt min/avg/max/mdev = 0.049/0.053/0.073/0.010 ms, pipe 2
我用的是铁通2M宽带.在同一时间 ping
www.163.com. 实验时间:7月8日星期六 17:50.
在嵌入式操作系统下运行:
/ # ping
www.163.com
PING
www.cache.split.netease.com (220.181.28.42): 56 data bytes
64 bytes from 220.181.28.42: icmp_seq=0 ttl=51 time=70.7 ms
64 bytes from 220.181.28.42: icmp_seq=1 ttl=51 time=80.2 ms
64 bytes from 220.181.28.42: icmp_seq=2 ttl=51 time=76.5 ms
64 bytes from 220.181.28.42: icmp_seq=3 ttl=51 time=79.5 ms
64 bytes from 220.181.28.42: icmp_seq=4 ttl=51 time=78.3 ms
64 bytes from 220.181.28.42: icmp_seq=5 ttl=51 time=81.1 ms
64 bytes from 220.181.28.42: icmp_seq=6 ttl=51 time=81.3 ms
64 bytes from 220.181.28.42: icmp_seq=7 ttl=51 time=71.6 ms
64 bytes from 220.181.28.42: icmp_seq=8 ttl=51 time=76.2 ms
64 bytes from 220.181.28.42: icmp_seq=9 ttl=51 time=71.9 ms
64 bytes from 220.181.28.42: icmp_seq=10 ttl=51 time=80.5 ms
64 bytes from 220.181.28.42: icmp_seq=11 ttl=51 time=73.5 ms
64 bytes from 220.181.28.42: icmp_seq=12 ttl=51 time=70.4 ms
64 bytes from 220.181.28.42: icmp_seq=13 ttl=51 time=70.6 ms
---
www.cache.split.netease.com ping statistics ---
14 packets transmitted, 14 packets received, 0% packet loss
round-trip min/avg/max = 70.4/75.8/81.3 ms
对比开发机是同一台机器,linux FC4操作系统)
[root@localhost ~]# ping
www.163.com
PING
www.cache.split.netease.com (202.108.9.16) 56(84) bytes of data.
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=0 ttl=49 time=344 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=1 ttl=49 time=343 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=2 ttl=49 time=337 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=3 ttl=49 time=348 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=6 ttl=49 time=352 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=7 ttl=49 time=346 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=8 ttl=49 time=350 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=9 ttl=49 time=347 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=10 ttl=49 time=339 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=11 ttl=49 time=342 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=12 ttl=49 time=344 ms
64 bytes from zz-9-16-a8.bta.net.cn (202.108.9.16): icmp_seq=13 ttl=49 time=336 ms
---
www.cache.split.netease.com ping statistics ---
14 packets transmitted, 12 received, 14% packet loss, time 13010ms
rtt min/avg/max/mdev = 336.532/344.337/352.070/4.678 ms, pipe 2
运行结果显示:linux FC4操作系统的性能不如"嵌入式linux路由系统"稳定和快速.
我原来就是用RedHat linux ------>Gentoo linux ---------> 嵌入式linux,一个比一个好.我相信这已经是"网吧的极品路由器".自己很满意.