Re: Server stop receiving traffic

Stef Coene
Tue, 26 Aug 2003 17:26:39 -0000

On Tuesday 26 August 2003 01:19, Jay Lee wrote:
> I''ve tried hard to find answers to below questions without any
luck. Please
> help me!
>
> 1. If I do not specify burst, server stops receiving traffic after 5~10
> mins. But if I specify burst value to 1500, the server never dies but the
> performance is very bad. What would be the best burst rate??
What is the burst calculated by htb if you specify no burst ?  And can you
send me your full tc scripts and the output from tc -s -d class show dev ...
?

> 2. If I enter 1500 as burst or cburst, tc show command shows it as 1499.
> Why is this happening?
>
> #tc class add dev eth0 parent 1:1 classid 1:404 htb rate 14kbit ceil
> 128kbit quantum 1501 burst 1501 cburst 1501
> #tc class show dev eth0
> ....
> class htb 1:404 parent 1:1 prio 0 rate 14Kbit ceil 128Kbit burst 1500b
> cburst 1500b
> ....
>
>
> #tc class add dev eth0 parent 1:1 classid 1:404 htb rate 14kbit ceil
> 128kbit quantum 1500 burst 1500 cburst 1500
> #tc class show dev eth0
> ....
> class htb 1:404 parent 1:1 prio 0 rate 14Kbit ceil 128Kbit burst 1499b
> cburst 1499b
> ....
Somehow (my c is not so good) htb recalculates the burst (cburst) and uses the
rate (ceil) to do so.  The funcion is called tc_calc_xmittime in file
tc_core.c (tc source).
tc_calc_xmittime = calculate transmit time ???

Stef

--

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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