Re: Linux 2.6.15.2

[Holger Eitzenberger <holger@my-eitzenberger.de>]

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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