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Date:	Sat, 07 May 2011 20:42:29 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alex Bligh <alex@...x.org.uk>
Cc:	netdev@...r.kernel.org
Subject: Re: Scalability of interface creation and deletion


Here is my trace here for one device deletion on one 8 core machine

[  800.447012] synchronize_rcu() in 15787 us
[  800.455013] synchronize_rcu() in 7682 us
[  800.464019] rcu_barrier() in 8487 us

Not that bad.

$ grep RCU .config
# RCU Subsystem
CONFIG_TREE_RCU=y
# CONFIG_PREEMPT_RCU is not set
CONFIG_RCU_TRACE=y
CONFIG_RCU_FANOUT=32
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
CONFIG_TREE_RCU_TRACE=y


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