Hi Joost,
I think that maybe you have run across an issue that I too had trouble
with. A snip from a message from Martin BROWN explains:
> You have not actually found a bug, but rather a historical strangeness
> about the Linux traffic control system. For reasons of which I'm
> ignorant, the syntax for the "tc" command uses bps for bytes/second.
So,
> 64000 bytes/second is actually 512 kilobits/second ("512 kbps" in
common
> usage), but is 512 kbit to the "tc" tool. Here's a brief chart:
>
> tc syntax tcng syntax
> +----------------+----------------+
> bytes/second | bps | Bps |
> bits/second | bit | bps |
> kilobytes/second | kbps | kBps |
> kilobits/second | kbit | kbps |
> +----------------+----------------+
>
> Note that the tcng syntax is exactly the same sort of syntax we use in
> general when discussing speed of WAN links. "It's a 512 kbps line"
means
> it's 512 kilobits per second, but this would be 64000 bytes per second
if
> we were writing a "tc" command line.
Hope this helps!
Cheers
Chalres
On Thu, 2004-08-05 at 09:53, Joost Kraaijeveld wrote:
> Hi all,
>
> We have 2 class C networks that are connected by a Linux router with the internet. We want to apply traffic control (bandwidth control). For that we wrote the tcc script below. We have 2 problems:
>
> 1. To establish a 2 megagit download we must actually set the value to 2500kbps. Is there a possible reason for that?
> 2. If we enable the WAN device we get very hight ping times (they change from 21.1 ms to > 2000 ms) and erratic upload values that partly suffer from the problem above (we want to allow for an upload of 512kb and have to specify a upload of 712 to get that) but most of the time we have a far worse actual upload. Anyone any ideas?
>
> We use Debian 2.6.3-1-386 (Sarge) with tcng 9m.
>
> Any help is greatly appreciated.
>
> Groeten,
>
> Joost Kraaijeveld
> Askesis B.V.
> Molukkenstraat 14
> 6524NB Nijmegen
> tel: 024-3888063 / 06-51855277
> fax: 024-3608416
> e-mail: J.Kraaijeveld@xxxxxxxxxx
> web: www.askesis.nl
>
> ///////////////////////////////////////////////////////////////////////////
> #include "fields.tc"
> #include "ports.tc"
>
> #define WAN eth0
> #define LAN83 eth1
> #define LAN84 eth2
>
> /* The WAN section is about upload to the internet */
>
> dev WAN
> {
> egress
> {
> class ( <$uploadRouter> ) if ip_src == 192.168.83.1 || ip_src == 192.168.84.1;
> class ( <$uploadGKS> ) if ip_src == 192.168.83.22 ;
> class ( <$upload83> ) if ip_src:24 == 192.168.83.0 ;
> class ( <$upload84> ) if ip_src:24 == 192.168.84.0 ;
> class ( <$others> ) if 1 ;
>
> htb ()
> {
> class ( rate 18Mbps, ceil 18Mbps )
> {
> $uploadRouter = class ( rate 18Mbps, ceil 18Mbps );
> $uploadGKS = class ( rate 10Mbps, ceil 10Mbps ) ;
> $upload83 = class ( rate 5Mbps, ceil 5Mbps ) ;
> $upload84 = class ( rate 712kbps, ceil 712kbps ) ;
> $others = class ( rate 18Mbps , ceil 18Mbps ) ;
> }
> }
> }
> }
>
> /* This section is about downloading to the 83 network */
>
> dev LAN83
> {
> egress
> {
> class ( <$downloadRouter> ) if ip_dst == 192.168.83.1;
> class ( <$downloadGKS> ) if ip_dst == 192.168.83.22;
> class ( <$download> ) if ip_dst:24 == 192.168.83.0;
> class ( <$others> ) if 1 ;
>
> htb ()
> {
> class ( rate 18Mbps, ceil 18Mbps )
> {
> $downloadRouter = class ( rate 18Mbps, ceil 18Mbps ) ;
> $downloadGKS = class ( rate 10Mbps, ceil 10Mbps ) ;
> $download = class ( rate 5Mbps, ceil 5Mbps ) ;
> $others = class ( rate 18Mbps, ceil 18Mbps ) ;
> }
> }
> }
> }
>
> /* This section is about downloading to the 84 network */
>
> dev LAN84
> {
> egress
> {
> class ( <$download> ) if ip_dst:24 == 192.168.84.0;
> class ( <$others> ) if 1 ;
> htb ()
> {
> class ( rate 18Mbps, ceil 18Mbps )
> {
> $download = class ( rate 2500kbps,ceil 2500kbps ) ;
> $others = class ( rate 18Mbps, ceil 18Mbps ) ;
> }
> }
> }
> }
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