From: Eric Dumazet <dada1@cosmosbay•com>
To: Benjamin LaHaise <bcrl@lhnet•ca>
Cc: Denys Fedoryschenko <denys@visp•net.lb>, netdev@vger•kernel.org
Subject: Re: regression: unregister_netdev() unusably slow
Date: Sun, 24 May 2009 23:42:17 +0200 [thread overview]
Message-ID: <4A19BF39.4000305@cosmosbay.com> (raw)
In-Reply-To: <20090524213744.GG24757@kvack.org>
Benjamin LaHaise a écrit :
> On Mon, May 25, 2009 at 12:23:30AM +0300, Denys Fedoryschenko wrote:
>> Once oprofile gave me hint about similar issue
>
> I forgot to mention: there is no more than ~1% CPU usage while the interfaces
> are being deleted. I'm about half way through the bisect now and should have
> the culprit soon.
>
> -ben
unregister a vlan here cost about 100 ms if CONFIG_NO_HZ is set, 50 ms if not set
(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()
next prev parent reply other threads:[~2009-05-24 21:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-24 19:21 regression: unregister_netdev() unusably slow Benjamin LaHaise
2009-05-24 21:23 ` Denys Fedoryschenko
2009-05-24 21:37 ` Benjamin LaHaise
2009-05-24 21:42 ` Eric Dumazet [this message]
2009-05-24 21:44 ` Benjamin LaHaise
2009-05-24 22:07 ` Eric Dumazet
2009-05-24 22:12 ` Benjamin LaHaise
2009-05-24 22:47 ` Eric Dumazet
2009-05-25 0:00 ` Benjamin LaHaise
2009-05-25 5:22 ` Eric Dumazet
2009-05-25 8:04 ` Damien Wyart
2009-05-25 16:21 ` Paul E. McKenney
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