netdev - Re: [net-next-2.6 PATCH 2/5] ixgbe: drop support for UDP in RSS hash generation

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Date:	Tue, 20 Jul 2010 08:39:40 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	bphilips@...ell.com, Alexander Duyck <alexander.h.duyck@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>
Subject: Re: [net-next-2.6 PATCH 2/5] ixgbe: drop support for UDP in RSS
 hash generation

Le lundi 19 juillet 2010 à 16:59 -0700, Jeff Kirsher a écrit :
> From: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> This change removes UDP from the supported protocols for RSS hashing.  The
> reason for removing this protocol is because IP fragmentation was causing a
> network flow to be broken into two streams, one for fragmented, and one for
> non-fragmented and this in turn was causing out-of-order issues.
> 

Jeff, does it mean all UDP packets are going to be delivered to a single
queue ?

This would be a serious regression.

Many UDP applications try hard to not use fragments. 

They are going to pay the price because some application :
- Use big segments, fragmented.
- Is subject to OOO artifacts.

We would like some clarifications please :)



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