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

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Message-ID: <20080131183735.GC4671@one.firstfloor.org>
Date:	Thu, 31 Jan 2008 19:37:35 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Disable TSO for non standard qdiscs

On Thu, Jan 31, 2008 at 07:01:00PM +0100, Patrick McHardy wrote:
> Andi Kleen wrote:
> >>Fix the broken qdisc instead.
> >
> >What do you mean? I don't think the qdiscs are broken.
> >I cannot think of any way how e.g. TBF can do anything useful
> >with large TSO packets.
> 
> 
> Someone posted a patch some time ago to calculate the amount
> of tokens needed in max_size portions and use that, but IMO
> people should just configure TBF with the proper MTU for TSO.

TBF with 64k atomic units will always be chunky and uneven. I don't
think that's a useful goal. 

-Andi

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