netdev - Re: [PATCH net-next v5 1/3] net: ipv6: Unduplicate {raw,udp}v6

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Message-Id: <20140425.133303.375967970436600096.davem@davemloft.net>
Date:	Fri, 25 Apr 2014 13:33:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	David.Laight@...LAB.COM, lorenzo@...gle.com,
	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next v5 1/3] net: ipv6: Unduplicate
 {raw,udp}v6_sendmsg code

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Fri, 25 Apr 2014 19:19:09 +0200

> Maybe we can put all those hlimit, tclass, dontfrag vars into a struct
> and just pass one pointer.

It's still an unnecessary memory dereference.

The compiler can potentially optimize the accesses to those variables
into a local register with the existing code, with this consolidation
it no longer can.
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