netdev - Re: Does HTB traffic shaping happen on leaf classes only or could it happen at root qdisc

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Message-ID: <4a9dfdec0803200707v15f65d8oba1933f1b20e406c@mail.gmail.com>
Date:	Thu, 20 Mar 2008 15:07:05 +0100
From:	"Djalel Chefrour" <cdjalel@...il.com>
To:	"Jarek Poplawski" <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Does HTB traffic shaping happen on leaf classes only or could it happen at root qdisc

THX for your reply.

>  > # tc -s -d class show dev ppp0
>  > class htb 1:110 parent 1:10 leaf 110: prio 0 quantum 1375 rate 110Kbit
>  > ceil 220Kbit burst 323b/2 mpu 0b overhead 18b atm cburst 392b/2 mpu 0b
>
>  Are these default quantum, burst and cburst parameters?
>
Yes they are. I forget to mention that I am also using tc-atm pacth with:
atm overhead 18 nohys mtu 256, for 1:10
atm overhead 18 nohys, for 1:20

>
>  > overhead 18b atm level 0
>  >  Sent 3888361 bytes 19368 pkts (dropped 0, overlimits 0)
>  >  rate 7160bit 35pps
>  >  lended: 19348 borrowed: 20 giants: 50
>
>  giants (>mtu) means something goes out of band here.
>
Hmmm, that could be explained with mtu set to 256

>
>  No, HTB root qdisc doesn't even have parameter for shaping.
>  BTW, did you read this fine manual?:
>  http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm
>

Yes, thats what I read too, but the output shows 0 overlimits for all
nodes but root !!!
So how to interpret this?

TIA

-- 
Dr Djalel Chefrour,
Software Consultant
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