Read shapter 9.2.2.1. Parameters & usage in Advanced Routing HOWTO mpu A zero-sized packet does not use zero bandwidth. For ethernet, no packet uses less than 64 bytes. The Minimum Packet Unit determines the minimal token usage for a packet 15.02.2000 8:37:10, Huang Xin Gang <hxgang@csnet4.cs.tsinghua.edu.cn> wrote: >Alexey Talikov,hello! > >Thanks for your help! >But my problem is still here.I found that if a packet is too short,the tick value which corresponds to it in the "rtab" is zero.That means the packet doesn't consume any tokens when it's being sent. > >Is my knowledge right? > > >======= 2002-06-03 09:09:00 you wrote:======= > >>Increase your burst it value at list MTU i.e 1500 byte >> >>rate=ST*burst (ST system timer 100HZ for intel/amd 1024 for alpha) >> rate >>burst=------- and burst>MTU >> ST >> >>See: Advanced routing HOWTO and for more details >>Short Evaluation of Linux's TBF Queueing Discipline. Kurt Wagner 17 May 2001 >> >>03.06.2002 7:27:30, Huang Xin Gang <hxgang@csnet4.cs.tsinghua.edu.cn> wrote: >> >>>LARTChello >>> >>>I set the command following: >>> >>>tc qdisc add dev eth0 root tbf rate 100kbit latency 50ms burst 120 >>> >>>and then I send flow with speed of 115.2kbit, and if all the packets sent is only 120bytes,the >>above command is useless. >>> >>>I thinks because the time occupied when sent a packet only 120 bytes is 120*8/(100*1024)<10ms, >>>but Linux system produces a tick every 10ms,so every time when a packet only 120 bytes >>>is being sent, the "toks" equals to zero always, and this packet can be sent immediately. >>> >>>all the packets are sent immediately, then the speed is not limited to 100kbit. >>> >>>How can I deal with this problem? >>> >>> best regards! >>> >>> >>> Huang Xin Gang >>> hxgang@csnet4.cs.tsinghua.edu.cn >>> 2002-06-03 >>>,S >>>f)+-L)Y?jya筋?ffvZ_j)fj?b?psLm?r >> >>----------------------------------- >>mailto:alexey_talikov@texlab.com.uz >>BR >>Alexey Talikov >>FORTEK >>----------------------------------- > >= = = = = = = = = = = = = = = = = = = = > > > best regards! > > Huang Xin Gang > hxgang@csnet4.cs.tsinghua.edu.cn > 2000-02-15 ----------------------------------- mailto:alexey_talikov@texlab.com.uz BR Alexey Talikov FORTEK ----------------------------------- _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
