netdev - Measurable performance improvements from RCU_INIT

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Message-ID: <20140719081240.GA13806@linux.vnet.ibm.com>
Date:	Sat, 19 Jul 2014 01:12:40 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	edumazet@...gle.com, davem@...emloft.net, brouer@...hat.com
Cc:	netdev@...r.kernel.org
Subject: Measurable performance improvements from RCU_INIT_POINTER()?

Hello!

Did the replacement of selected calls to rcu_assign_pointer() by
RCU_INIT_POINTER() in the networking stack result in measurable
system-level performance improvements?

The reason I ask is that some of the compiler guys on the C and C++
standards committees are suggesting changes that would add barriers
in some cases.  I suspect that this is a very bad idea, and was hoping
that you guys would have some hard numbers on the system-level effects
of barriers.  ;-)

							Thanx, Paul

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