netdev - Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

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Message-ID: <1307681270.3210.9.camel@edumazet-laptop>
Date:	Fri, 10 Jun 2011 06:47:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	tim.c.chen@...ux.intel.com, netdev@...r.kernel.org,
	andi@...stfloor.org
Subject: Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

Le jeudi 09 juin 2011 à 20:43 -0700, David Miller a écrit :
> From: Tim Chen <tim.c.chen@...ux.intel.com>
> Date: Thu, 09 Jun 2011 17:03:55 -0700
> 
> > When I retest with original 3.0-rc2 kernel, inet_putpeer no longer shows
> > up, wonder if dst->peer was not set for some reason. 
> 
> The overhead will only show up if an inetpeer entry exists for
> the destination IP address.
> 
> You can force one to be created, for example, by making a TCP
> connection to that destination.

Or sending big frames, to force ip fragmentation (we store the id
generator in inetpeer cache)



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