netdev - Re: ipw2200: firmware DMA loading rework

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Message-Id: <1253530608.5216.17.camel@penberg-laptop>
Date:	Mon, 21 Sep 2009 13:56:48 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Mel Gorman <mel@....ul.ie>, "Luis R. Rodriguez" <mcgrof@...il.com>,
	Tso Ted <tytso@....edu>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Zhu Yi <yi.zhu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Mel Gorman <mel@...net.ie>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	James Ketrenos <jketreno@...ux.intel.com>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw2100-devel@...ts.sourceforge.net" 
	<ipw2100-devel@...ts.sourceforge.net>
Subject: Re: ipw2200: firmware DMA loading rework

On Mon, 2009-09-21 at 12:46 +0200, Bartlomiej Zolnierkiewicz wrote:
> > > I don't know why people don't see it but for me it has a memory management
> > > regression and reliability issue written all over it.
> > 
> > Possibly but drivers that reload their firmware as a response to an
> > error condition is relatively new and loading network drivers while the
> > system is already up and running a long time does not strike me as
> > typical system behaviour.
> 
> Loading drivers after boot is a typical desktop/laptop behavior, please
> think about hotplug (the hardware in question is an USB dongle).

Yeah, I wonder what broke things. Did the wireless stack change in
2.6.31-rc1 too? IIRC Mel ruled out page allocator changes as a suspect.

			Pekka

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