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

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Message-ID: <20071009020442.GA14746@gondor.apana.org.au>
Date:	Tue, 9 Oct 2007 10:04:42 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
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

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.

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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