netdev - Re: htb and UDP packages bigger than 1500

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Date:	Tue, 11 Dec 2007 09:48:19 +0100
From:	Arkadiusz Miskiewicz <arekm@...en.pl>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: htb and UDP packages bigger than 1500

On Tuesday 11 of December 2007, Jarek Poplawski wrote:
> On Tue, Dec 11, 2007 at 09:17:30AM +0100, Arkadiusz Miskiewicz wrote:
> > On Tuesday 11 of December 2007, Jarek Poplawski wrote:
> > > On 10-12-2007 18:10, Arkadiusz Miskiewicz wrote:
> > > > Hello,
> > > >
> > > > I noticed that HTB doesn't properly limit traffic if someone sends
> > > > UDP packages bigger than 1500.
> > > >
> > > > Does HTB have some problems/known limits in this area?
> > > >
> > > > There is other traffic in that class and when I drop udp packets
> > > > bigger than 1500 then remaining traffic is limited properly to
> > > > correct value.
> > >
> > > Should work with proper "mtu" parameter (tc qdisc add htb help) or,
> > > for kernels >= 2.6.23, even without this. If this doesn't help,
> > > probably more information is required.
> >
> > 2.6.22 there. mtu wasn't specified at tc... Could you point to a git
> > commit which "fixes" the issue in 2.6.23 so I could backport it to my
> > 2.6.22?
>
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.23.y.git;a=commi
>tdiff;h=c9726d6890f7f3a892c879e067c3ed839f61e745
>
> From: Ranjit Manomohan <ranjitm@...gle.com>
> Date: Wed, 11 Jul 2007 05:43:16 +0000 (-0700)
> Subject: [NET_SCHED]: Make HTB scheduler work with TSO.
> X-Git-Tag: v2.6.23-rc1~1109^2~22

Backported.

> But this is done with two different ways. And btw., if there is such
> a big difference in sizes it could be not very accurate after all.

Hm, here htb qdisc is attached to imq devices which have mtu 16000 by default 
(in latest patch; previously that was 1500). I'll just lower it to 1500 for 
now. Thanks.

> Jarek P.

-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/
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