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Date:	Mon, 25 May 2009 00:23:30 +0300
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	Benjamin LaHaise <bcrl@...et.ca>
Cc:	netdev@...r.kernel.org
Subject: Re: regression: unregister_netdev() unusably slow

Once oprofile gave me hint about similar issue

On Sunday 24 May 2009 22:21:50 Benjamin LaHaise wrote:
> Hi folks,
>
> I just ran a few L2TP tests against 2.6.30-rc7, and it looks like network
> device deletion has become unusably slow.  At least in 2.6.27.10, deleting
> 1000 network interfaces takes less than 2 seconds of real time.  The same
> test run under 2.6.30-rc7 is taking hundreds of seconds to delete 1000
> interfaces at a rate of about 5 per second.  The interfaces all share the
> same local ip address, but each have a single route to a unique client
> ip address.
>
> This is a fairly reasonable use-case, as a single L2TP daemon can be
> terminating thousands of client connections on a single tunnel, and a
> tunnel flap will require tearing down all these interfaces.  I'll work on
> bisecting it, but if someone has any ideas of the source, I'd appreciate
> hearing about it.
>
> 		-ben
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