I need help to change rmem value

[jefferson7]

Hi all
I'm simply trying to change rmem value to a higher value.
Tried on ubuntu/kubuntu 6.06, 6.10 and 7.04 (tried on Mandriva too) without success.
I checked my current rmem by using SpeedGuide.net TCP analyzer tool, and I found that the default rmem value is 5888. It's very low.

This is what I done:

- added
sysctl -w net.core.rmem_max=511104
sysctl -w net.core.rmem_default=511104
to /etc/rc.local. No success.


- added
echo 511104 > /proc/sys/net/core/rmem_default
echo 511104 > /proc/sys/net/core/rmem_max
to /etc/rc.local. No success.


- added
echo "4096 511104 511104" > /proc/sys/net/ipv4/tcp_rmem
echo "4096 16384 4194304" > /proc/sys/net/ipv4/tcp_wmem
to /etc/rc.local. No success.


- then I added
net.core.rmem_max=511104
net.core.rmem_default=511104
to /etc/sysctl.conf. No success.


- and finally added
net.ipv4.tcp_rmem=511104
net.ipv4.conf.default.tcp_rmem=511104
to /etc/sysctl.conf. No success.

I found these informations on this and other forums. All informations I found are concordant.

At this point, I have no more attempts

Please, help me to change rmem!

THANK YOU


p.s.: sorry for posting this thread in several places, but it's really my last chance!