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📁 一份很好的linux入门资料
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<HTML><HEAD>  <TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人:&nbsp;<A HREF="mailto:raytracy@tp.silkera.net">raytracy@tp.silkera.net</A>&nbsp;(Ray&nbsp;Tracy),&nbsp;看板:&nbsp;Linux&nbsp;<BR>标&nbsp;&nbsp;题:&nbsp;Re:&nbsp;Pentium&nbsp;的机器,&nbsp;but:&nbsp;telnet&nbsp;的速度有如牛步&nbsp;<BR>发信站:&nbsp;New&nbsp;Silkera&nbsp;Network&nbsp;(Tue&nbsp;Nov&nbsp;26&nbsp;11:24:54&nbsp;1996)&nbsp;<BR>转信站:&nbsp;sob!netnews.ntu!spring!serv.hinet.net!news.linkease.com.tw!news&nbsp;<BR>&nbsp;<BR><A HREF="mailto:fan@anesthesia.mc.ntu.edu.tw">fan@anesthesia.mc.ntu.edu.tw</A>&nbsp;(Shouzen&nbsp;Fan)&nbsp;wrote:&nbsp;<BR>&nbsp;<BR>＞<I>&nbsp;我在本科(台大医院麻醉科)装了linux，供给科内人使用&nbsp;</I><BR>＞<I>&nbsp;但&nbsp;telnet&nbsp;到此机器时其反应速度其慢无比&nbsp;(约一分钟，且在同一&nbsp;</I><BR>＞<I>&nbsp;Class&nbsp;C,&nbsp;同一&nbsp;Hub)&nbsp;</I><BR>&nbsp;<BR>1.&nbsp;观察&nbsp;telnet&nbsp;过程中,&nbsp;是等了很久才取得该主机的&nbsp;IP?&nbsp;还是已取得&nbsp;IP,&nbsp;<BR>但等了很久才出现&nbsp;Login?&nbsp;若是前者,&nbsp;问题应出在贵单位的&nbsp;DNS&nbsp;Server.&nbsp;<BR>&nbsp;<BR>2.&nbsp;在&nbsp;linux&nbsp;上用&nbsp;w&nbsp;指令查看&nbsp;loading,&nbsp;是否过重?&nbsp;若超过&nbsp;4.00&nbsp;以上,&nbsp;用&nbsp;<BR>free&nbsp;查看是否有&nbsp;swap&nbsp;的现象?&nbsp;若有的话,&nbsp;用&nbsp;ps&nbsp;-axl&nbsp;查看各&nbsp;process&nbsp;的&nbsp;<BR>SIZE&nbsp;和&nbsp;RSS,&nbsp;看哪个&nbsp;process&nbsp;吃掉太多的&nbsp;swap?&nbsp;<BR>&nbsp;<BR>3.&nbsp;观察由&nbsp;linux&nbsp;至&nbsp;client&nbsp;端的路径是否有异?&nbsp;用&nbsp;traceroute&nbsp;-n&nbsp;<BR>&lt;ip_address&gt;&nbsp;指令&nbsp;(将&nbsp;&lt;ip_address&gt;&nbsp;换成&nbsp;client&nbsp;端的&nbsp;IP)&nbsp;即可.&nbsp;同一个&nbsp;<BR>Class&nbsp;C&nbsp;上应该不超过一个&nbsp;hop&nbsp;才对,&nbsp;否则就是&nbsp;routing&nbsp;有问题.&nbsp;<BR>&nbsp;<BR>4.&nbsp;观察&nbsp;LAN&nbsp;上的通讯是否太拥挤?&nbsp;用&nbsp;ping&nbsp;-f&nbsp;&lt;ip_address&gt;&nbsp;指令,&nbsp;同样将&nbsp;<BR>&lt;ip_address&gt;&nbsp;换成&nbsp;client&nbsp;端&nbsp;IP;&nbsp;此指令只会显示一大堆&nbsp;dot,&nbsp;<BR>请在指令执行约&nbsp;5&nbsp;秒後,&nbsp;按&nbsp;Ctrl-C&nbsp;将其中断,&nbsp;然後看出现的统计,&nbsp;是否为&nbsp;0%&nbsp;<BR>packet&nbsp;loss?&nbsp;若packet&nbsp;loss&nbsp;高於&nbsp;0%&nbsp;的话,&nbsp;表示&nbsp;LAN&nbsp;上的通讯可能太繁忙.&nbsp;<BR>(注意:&nbsp;此指令类似於&nbsp;LAN&nbsp;上的广播风暴,&nbsp;请勿长时间使用!)&nbsp;<BR>&nbsp;<BR>5.&nbsp;在linux&nbsp;上&nbsp;telnet&nbsp;自己本身看看,&nbsp;用&nbsp;telnet&nbsp;localhost&nbsp;(127.0.0.1)&nbsp;和&nbsp;<BR>telnet&nbsp;&lt;ethernet_ip&gt;&nbsp;两者都试&nbsp;(&lt;ethernet_ip&gt;&nbsp;是指网路卡上的&nbsp;IP),&nbsp;<BR>若也很慢的话,&nbsp;可以将问题□限在&nbsp;linux&nbsp;上,&nbsp;否则问题应该在&nbsp;linux&nbsp;以外.&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>

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