netdev - Re: [PATCH] Disable TSO for non standard qdiscs

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Date:	Thu, 31 Jan 2008 19:21:20 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Disable TSO for non standard qdiscs

Andi Kleen wrote:
>> Then change TBF to use skb_gso_segment?  Be careful, the fact that
> 
> That doesn't help because it wants to interleave packets
> from different streams to get everything fair and smooth. The only 
> good way to handle that is to split it up and the simplest way to do 
> this is to just tell TCP to not do GSO in the first place.


Thats not correct, TBF keeps packets strictly ordered unless
an inner qdisc does reordering. But even then (let say you use
SFQ) packets of a single flow will stay ordered. Segmenting
TSO packets is no different than having them arrive independantly
for other reasons.
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