netdev - Re: ~3 hours old git tree: Virtual device lo asks to queue packet!

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Message-Id: <20070720.223352.71090112.davem@davemloft.net>
Date:	Fri, 20 Jul 2007 22:33:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	peter.p.waskiewicz.jr@...el.com, arekm@...en.pl,
	netdev@...r.kernel.org
Subject: Re: ~3 hours old git tree: Virtual device lo asks to queue packet!

From: Patrick McHardy <kaber@...sh.net>
Date: Sat, 21 Jul 2007 05:38:10 +0200

> Yes, some constant limit definitely makes sense. The Tx batching
> patches motivated me to work through struct net_device with pahole
> and I have some patches that rearrange it to save about 64 bytes and
> move some members from very unfortunate positions to better ones,
> but they still leave two 32 byte holes on SMP (with 64 byte
> cachelines). Plugging one of these with a statically sized subqueue
> array would be perfect since one of the holes is within the Tx
> cachelines anyway (at least for now, until we add subqueue locks ..).

This sounds great.

> Its 2.6.24 material though, and I very much hope they will clash
> with Stephen's plans to introduce struct net_device_ops.

Also see the napi_struct stuff I just posted as well.
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