netdev - Re: iptables very slow after commit 784544739a25c30637397ace5489eeb6e15d7d49

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Message-ID: <20090412173108.GO6822@linux.vnet.ibm.com>
Date:	Sun, 12 Apr 2009 10:31:08 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Lai Jiangshan <laijs@...fujitsu.com>, shemminger@...tta.com,
	jeff.chua.linux@...il.com, dada1@...mosbay.com, jengelh@...ozas.de,
	kaber@...sh.net, r000n@...0n.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: iptables very slow after commit
	784544739a25c30637397ace5489eeb6e15d7d49

On Sun, Apr 12, 2009 at 09:34:27PM +1000, Paul Mackerras wrote:
> Paul E. McKenney writes:
> 
> > If the generic implementation is needed only on !SMP systems, that
> > could work.  The architectures I would be worried about include
> > powerpc and ia64, which I believe support 32-bit SMP builds.
> 
> 32-bit powerpc doesn't have 64-bit atomic operations and does support
> SMP.
> 
> What about ARM?  I thought they had 32-bit SMP these days as well.

Some of Steve Hemminger's recent suggestions in this thread seem to me
to avoid this whole issue nicely.  But we will see!  ;-)

							Thanx, Paul
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