netdev - Re: [PATCH 2/3][NET_BATCH] net core use batching

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Message-Id: <20071008.194517.32744598.davem@davemloft.net>
Date:	Mon, 08 Oct 2007 19:45:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	jeff@...zik.org, hadi@...erus.ca, peter.p.waskiewicz.jr@...el.com,
	krkumar2@...ibm.com, johnpol@....mipt.ru, kaber@...sh.net,
	shemminger@...ux-foundation.org, jagana@...ibm.com,
	Robert.Olsson@...a.slu.se, rick.jones2@...com, xma@...ibm.com,
	gaagaan@...il.com, netdev@...r.kernel.org, rdreier@...co.com,
	mcarlson@...adcom.com, mchan@...adcom.com,
	general@...ts.openfabrics.org, tgraf@...g.ch,
	randy.dunlap@...cle.com, sri@...ibm.com
Subject: Re: [PATCH 2/3][NET_BATCH] net core use batching

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 9 Oct 2007 10:04:42 +0800

> On Tue, Oct 09, 2007 at 10:03:18AM +0800, Herbert Xu wrote:
> > On Tue, Oct 09, 2007 at 10:01:15AM +0800, Herbert Xu wrote:
> > > On Mon, Oct 08, 2007 at 06:41:26PM -0700, David Miller wrote:
> > > >
> > > > I also want to point out another issue.  Any argument wrt. reordering
> > > > is specious at best because right now reordering from qdisc to device
> > > > happens anyways.
> > > 
> > > This is not true.
> > > 
> > > If your device has a qdisc at all, then you will end up in the
> > > function qdisc_restart, where we release the queue lock only
> > > after acquiring the TX lock.
> > > 
> > > So right now this path does not create any reordering.
> > 
> > Argh! Someone's just broken this.  I think we should restore
> > the original behaviour.
> 
> Please revert
> 
> commit 41843197b17bdfb1f97af0a87c06d24c1620ba90
> Author: Jamal Hadi Salim <hadi@...erus.ca>
> Date:   Tue Sep 25 19:27:13 2007 -0700
> 
>     [NET_SCHED]: explict hold dev tx lock
> 
> As this change introduces potential reordering and I don't think
> we've discussed this aspect sufficiently.

Agreed, and done.
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