LARTC，hello！ 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 128bytes,the above command is useless. I thinks because the time occupied when sent a packet only 128 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
LARTC，hello！ 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
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:
>LARTC，hello！
>
>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)鄸+-L)殜Y殱?jya囤?f蟌瀇鎗)fj?鍔薭濟?暘韕s朙鑝稛?暘韗娻
-----------------------------------
mailto:alexey_talikov@texlab.com.uz
BR
Alexey Talikov
FORTEK
-----------------------------------
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 whichcorresponds 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: >> >>>LARTC，hello！ >>> >>>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)鄸+-L)殜Y殱?jya囤?f蟌瀇鎗)fj?鍔薭濟?暘韕s朙鑝稛?暘韗娻 >> >>----------------------------------- >>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 -----------------------------------