Date: Sat, 4 Feb 2006 12:52:17 +0100
From: Holger Eitzenberger <holger@my-eitzenberger.de>
To: Andrew Morton <akpm@osdl.org>
Cc: gregkh@suse.de, linux-kernel@vger.kernel.org, stable@kernel.org,
       torvalds@osdl.org, netdev@vger.kernel.org
Subject: Re: Linux 2.6.15.2
Message-ID: <20060204115217.GA5302@kruemel.my-eitzenberger.de>
Mail-Followup-To: Andrew Morton <akpm@osdl.org>, gregkh@suse.de,
	linux-kernel@vger.kernel.org, stable@kernel.org, torvalds@osdl.org,
	netdev@vger.kernel.org
References: <20060131070642.GA25015@kroah.com> <20060130233427.5e7912ae.akpm@osdl.org> <20060203120925.GA4393@kruemel.my-eitzenberger.de> <20060203111414.7026f46f.akpm@osdl.org>
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On Fri, Feb 03, 2006 at 11:14:14AM -0800, Andrew Morton wrote:

> http://www.mail-archive.com/netdev@vger.kernel.org/msg06355.html

> > A look into /proc/sys/net/ipv4/tcp_mem showed that that the values in
> > there were way to high.  I hope that a reduction of these values will
> > help (not done yet).

> Sounds different.  Please test a more recent kernel and if the problem is
> still there, send a report to linux-kernel and cc netdev@vger.kernel.org. 
> Include the contents of /proc/meminfo and /proc/slabinfo.  Thanks.

I solved the issue.

Recent kernels have alloc_large_system_hash() exactly for that, and
tcp_init() uses it.  It has nr_all_pages and nr_kernel_pages to
determine the actual size of usable RAM, whereas 2.6.10 just uses
num_physpages.  That's the reason why the values in tcp_mem are way
too high on machines with 3-4 Gig RAM.

Thanks.  /holger


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