netdev - Re: regression: unregister

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Message-ID: <20090524214433.GH24757@kvack.org>
Date:	Sun, 24 May 2009 17:44:33 -0400
From:	Benjamin LaHaise <bcrl@...et.ca>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Denys Fedoryschenko <denys@...p.net.lb>, netdev@...r.kernel.org
Subject: Re: regression: unregister_netdev() unusably slow

On Sun, May 24, 2009 at 11:42:17PM +0200, Eric Dumazet wrote:
> (But vlan case might be litle bit more expensive than your case, since we call
> synchronize_net() three times (once in unregister_vlan_dev(), and twice in rollback_registered()

I did try commenting out the synchronize_net() calls in rollback_registered(), 
but that had almost no effect on the rate of interface deletion.  50ms is 
still way too expensive.

		-ben
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