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

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Date:	Fri, 1 Feb 2008 22:47:39 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Disable TSO for non standard qdiscs

On Fri, Feb 01, 2008 at 01:28:15AM -0800, Waskiewicz Jr, Peter P wrote:
...
> The TCP layer will generate TSO packets based on the kernel socket
> features associated with the flow.  So if you have two devices, one
> supporting TSO, the other not, then the flows associated with the
> non-TSO device will not have their packets built for TSO.  This has no
> bearing on the device supporting TSO, which its feature flags will
> propogate into the kernel socket for that flow, and cause any TCP flows
> to that device to be TSO packets.  So in a nutshell, disabling TSO is on
> a per-device level, not a global switch.

Fine, but I was rather wondering if there could be something more in
the idea of this patch that can't be done with ethtool. And I don't
think qdisc code currently treats or should treat TCP special.

Jarek P.
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