netdev - Re: [PATCH] net: dev: fix the incorrect hold of net namespace's lo device

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Message-ID: <1345691589.5904.33.camel@edumazet-glaptop>
Date:	Thu, 23 Aug 2012 05:13:09 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	ebiederm@...ssion.com, davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] net: dev: fix the incorrect hold of net namespace's lo
 device

On Wed, 2012-08-22 at 10:39 +0200, Eric Dumazet wrote:

> rcu_barrier() at this place will kill some workloads.

For example, I tested the following one :

modprobe dummy numdummies=1000
time rmmod dummy

-> 16.5 seconds instead of 0.4 second


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