netdev - RE: Linux 2.6 HTB does only work with existing connections

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Date:	Wed, 21 Feb 2007 19:07:39 -0800
From:	"Hua Zhong" <hzhong@...il.com>
To:	<netdev@...r.kernel.org>
Subject: RE: Linux 2.6 HTB does only work with existing connections

Correction: it's TSO, not TOE.

By googling I found that specifying a big MTU (like 16500) on the "tc class"
command avoids the "giant" packets. No idea where they come from.

Any better idea on a proper fix?

> -----Original Message-----
> From: Hua Zhong [mailto:hzhong@...il.com]
> Sent: Wednesday, February 21, 2007 6:30 PM
> To: 'netdev@...r.kernel.org'
> Subject: RE: Linux 2.6 HTB does only work with existing connections
> 
> Just add more info: this machine has TOE. And if that's turned off,
> everything seems to work fine.
> 
> Does it mean that traffic control doesn't play well with TOE? Or there
> are some tricks to make them work together?
> 
> Thanks for any pointers.
> 
> BTW: it's x86_64 but I guess it doesn't matter much.
> 
> > -----Original Message-----
> > From: Hua Zhong [mailto:hzhong@...il.com]
> > Sent: Wednesday, February 21, 2007 5:45 PM
> > To: 'netdev@...r.kernel.org'
> > Subject: Linux 2.6 HTB does only work with existing connections
> >
> > Hi all,
> >
> > I tried to use HTB on a 2.6.12 based kernel. It seems that if I issue
> > the tc commands, existing connections adjust bandwidth immediately,
> but
> > any new connections won't be filtered correctly.
> >
> > The tc version is 3.17.
> >
> > The commands are very simple (only eth1 is active):
> >
> >     tc qdisc del dev eth1 root
> >     tc qdisc add dev eth1 root handle 1: htb default 20
> >     tc class add dev eth1 parent 1: classid 1:20 htb rate 4000kbit
> >
> > No filters, just limit everything to under 4Mbit.
> >
> > Then run ttcp to a remote machine, ifconfig shows eth1 is not limited.
> >
> > However, while ttcp is running, issue the above three commands again,
> > the bandwidth is then limited correctly.
> >
> > Any ideas?
> >
> > The following are the show commands:
> >
> > # tc qdisc show dev eth1
> > qdisc htb 1: r2q 10 default 20 direct_packets_stat 11
> > # tc class show dev eth1
> > class htb 1:20 root prio 0 rate 4000Kbit ceil 4000Kbit burst 2099b
> > cburst 2099b
> >
> > Please cc me.
> >
> > Hua

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