netdev - Re: [PATCH net-next] htb: reorder struct htb

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Message-Id: <20130613.171725.167784637364785392.davem@davemloft.net>
Date:	Thu, 13 Jun 2013 17:17:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH net-next] htb: reorder struct htb_class fields for
 performance

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 13 Jun 2013 07:58:30 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> htb_class structures are big, and source of false sharing on SMP.
> 
> By carefully splitting them in two parts, we can improve performance.
> 
> I got 9 % performance increase on a 24 threads machine, with 200
> concurrent netperf in TCP_RR mode, using a HTB hierarchy of 4 classes.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Tom Herbert <therbert@...gle.com> 

Applied, thanks Eric.
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