netdev - Re: [RFC][PATCH] iproute: Faster ip link add, set and delete

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Date:	Thu, 28 Mar 2013 18:10:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Benoit Lourdelet <blourdel@...iper.net>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC][PATCH] iproute: Faster ip link add, set and delete

On Thu, 2013-03-28 at 17:43 -0700, Eric Dumazet wrote:

> In batch mode, I can create these veth pairs in 4 seconds
> 
> for i in $(seq 1 5000) ; do echo link add a$i type veth peer name b$i;
> done | ip -batch -


At rmmod time, 30% of cpu is spent in packet_notifier()

Maybe we can do something about this.

   30.85%         rmmod  [kernel.kallsyms]     [k]
packet_notifier                                                                                 
                   |
                   --- packet_notifier
                       notifier_call_chain
                       raw_notifier_call_chain
                       call_netdevice_notifiers
                       rollback_registered_many
                       unregister_netdevice_many
                       __rtnl_link_unregister
                       rtnl_link_unregister
                       0xffffffffa0044868
                       sys_delete_module
                       sysenter_dispatch


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