linux-kernel - Re: [PATCH v2] IPVS: logging sizeof(struct ip_vs

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Message-ID: <20090728001926.GA20230@verge.net.au>
Date:	Tue, 28 Jul 2009 10:19:27 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	David Miller <davem@...emloft.net>
Cc:	heder@...gle.com, netdev@...r.kernel.org, eric.dumazet@...il.com,
	lvs-users@...uxvirtualserver.org, malcolm@...dbalancer.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] IPVS: logging sizeof(struct ip_vs_conn) on startup

On Mon, Jul 27, 2009 at 11:48:45AM -0700, David Miller wrote:
> From: Hannes Eder <heder@...gle.com>
> Date: Mon, 27 Jul 2009 15:13:57 +0200
> 
> > No more guessing, how much memory used by IPVS for a connection.
> > 
> > [ The number printed is a lower bound, as ip_vs_conn_cache uses
> > SLAB_HWCACHE_ALIGN. ]
> > 
> > Signed-off-by: Hannes Eder <heder@...gle.com>
> > Signed-off-by: Simon Horman <horms@...ge.net.au>
> 
> Who needs to know this?  A developer?
> 
> They can run tools such as 'pahole' et al. to fish out this
> information even when only a kernel binary is available.
> 
> For the user, it's just noise.
> 
> I'm not applying this, sorry.

Surprisingly its a very common question amongst users,
because they want to know how much memory they need.
It is of course all a bit silly, because the amount of
memory used by the connection table is usually very small,
but people still ask.

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