netdev - Re: [PATCH] IPVS: logging sizeof(struct ip_vs

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Message-ID: <b5ddba180907270334m4bc4e968m85c16ea4756c3f5d@mail.gmail.com>
Date:	Mon, 27 Jul 2009 12:34:42 +0200
From:	Hannes Eder <heder@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, lvs-users@...uxvirtualserver.org,
	malcolm@...dbalancer.org, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH] IPVS: logging sizeof(struct ip_vs_conn) on startup

On Mon, Jul 27, 2009 at 11:25, Eric Dumazet<eric.dumazet@...il.com> wrote:
> Well, ip_vs_conn_cache uses SLAB_HWCACHE_ALIGN, so this should be rounded up
> to L1 cache size. Or add "at least" like in line 1080
> of net/netfilter/ipvs/ip_vs_conn.c :
>
> IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
>           sizeof(struct ip_vs_conn));

Good point.  Is there an easy way to figure out how much memory is
wasted for alignment by the slab allocator?  Otherwise I vote for the
"at least" approach.

-Hannes
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