linux-kernel - Re: [RFC Patch net-next 3/5] inetpeer: use generic union inet

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Message-ID: <1372668049.2974.25.camel@cr0>
Date:	Mon, 01 Jul 2013 16:40:49 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, linux-kernel@...r.kernel.org
Subject: Re: [RFC Patch net-next 3/5] inetpeer: use generic union inet_addr

On Thu, 2013-06-27 at 01:01 -0700, Eric Dumazet wrote:
> On Thu, 2013-06-27 at 14:43 +0800, Cong Wang wrote:
> >  struct inet_peer {
> >  	/* group together avl_left,avl_right,v4daddr to speedup lookups */
> >  	struct inet_peer __rcu	*avl_left, *avl_right;
> > -	struct inetpeer_addr	daddr;
> > +	union inet_addr		daddr;
> 
> Please compare sizeof(struct inetpeer_addr) and sizeof(union inet_addr)
> 
> If I am not mistaken, its 20 bytes instead of 28
> 
> Yes, sockaddr_in6 is a bit bloated...
> 

You are right.

Are you saying that I should rearrange the fields of struct inet_peer in
case of cacheline miss?

Thanks!

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