netdev - Re: [PATCH] net: allow netdev_wait

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Message-ID: <20100809174856.GS30010@kvack.org>
Date:	Mon, 9 Aug 2010 13:48:56 -0400
From:	Benjamin LaHaise <bcrl@...et.ca>
To:	Ben Greear <greearb@...delatech.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Octavian Purdila <opurdila@...acom.com>,
	netdev@...r.kernel.org, Cosmin Ratiu <cratiu@...acom.com>
Subject: Re: [PATCH] net: allow netdev_wait_allrefs() to run faster

On Mon, Aug 09, 2010 at 10:44:14AM -0700, Ben Greear wrote:
> We also have a few rules per interface, and notice that it takes around 10ms
> per rule when we are removing them, even when using batching in 'ip':
...
> Patrick thought had an idea, but I don't think he had time to
> look at it further:
> 
> "Its probably the synchronize_rcu() in fib_nl_delrule() and
> the route flushing happening after rule removal."

Yes, that would be a problem, but the issue is deeper than that -- if I'm 
not mistaken it's on the packet processing path that iptables doesn't scale 
for 100k interfaces with 1 rule per interface.  It's been a while since I 
ran the tests, but I don't think it's changed much.

		-ben
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