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

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Date:	22 Feb 2007 14:47:38 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Hua Zhong" <hzhong@...il.com>
Cc:	<netdev@...r.kernel.org>
Subject: Re: Linux 2.6 HTB does only work with existing connections

"Hua Zhong" <hzhong@...il.com> writes:

> 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.

They come from TCP because it will pass down a max MTU sized packet
(upto 64k) for the NIC to segment (Tcp Segmentation Offload)

But the traffic control cannot work with such large packets.

> Any better idea on a proper fix?

Hmm, that's nasty.   The only workaround I could think of would
be to force TSO/LSO off when a non standard queueing discipline is active.

-Andi
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