> Accorting to TCP man page, the kernel calculates the values of 
> sysctl_tcp_mem depending on available physical memory at boot time.
> I added 2GB RAM to a machine that had 2GB, and then it has 4GB RAM now. 
> However, the value of sysctl_tcp_mem[2] has not changed from 196608 
> (pages). The machine is running at Linux 2.6.16.5 i686 Intel(R) 
> Pentium(R) 4 CPU 3.06GHz.

TCP can only use low memory for this which is limited to around 900MB 
on 32bit systems. 64bit CPUs don't have this problem.

-Andi
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