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

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Message-ID: <20080131190326.GF4671@one.firstfloor.org>
Date:	Thu, 31 Jan 2008 20:03:26 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Rick Jones <rick.jones2@...com>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH] Disable TSO for non standard qdiscs

On Thu, Jan 31, 2008 at 10:26:19AM -0800, Rick Jones wrote:
> Andi Kleen wrote:
> >TSO interacts badly with many queueing disciplines because they rely on 
> >reordering packets from different streams and the large TSO packets can 
> >make this difficult. This patch disables TSO for sockets that send over 
> >devices with non standard queueing disciplines. That's anything but noop 
> >or pfifo_fast and pfifo right now.
> 
> Does this also imply that JumboFrames interacts badly with these qdiscs? 
>  Or IPoIB with its 65000ish byte MTU?

Correct. Of course it is always relative to the link speed. So if your
link is 10x faster and your packets 10x bigger you can get similarly
smooth shaping.

-Andi
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