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

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Message-ID: <47A29F8B.7080807@trash.net>
Date:	Fri, 01 Feb 2008 05:26:51 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Disable TSO for non standard qdiscs

Waskiewicz Jr, Peter P wrote:
>> Well, it could be just that when using such qdiscs TSO would be
>> disabled, but the user could override this by using ethtool after
>> loading the qdiscs.
> 
> I still disagree with this.  The qdisc should not cause anything to happen to feature flags on the device. It's the scheduling layer and really shouldn't care about what features the device supports or not.  If someone has an issue with a feature hurting performance or causing odd behavior when using a qdisc, then they should disable the feature on the device using the appropriate tools provided.  If it's the qdisc causing issues, then either the qdisc needs to be fixed, or it should be documented what features are recommended to be on and off with the qdisc.  I don't agree that the scheduling layer should affect features on an underlying device.

Andi's patch made the TSO capable flag a property of the
qdisc (not the ops), so it could still be explicitly
configured by the user.


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