I tried sev­eral dif­fer­ent Linux dis­tri­b­u­tions (Gen­too, Debian, Open­Suse…) on my lap­top, but every dis­tri­b­u­tion suf­fered from the same prob­lem — the max­i­mal LAN through­put was around 5–7 kb/s… The lap­top use a Real­tek LAN NIC:

Eth­er­net con­troller: Real­tek Semi­con­duc­tor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

I’m using the 8139too Ker­nel mod­ule for the LAN card. To fix the speed issue, I had to change some sysctl variables:

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michu@opensusi:~/_down> cat /etc/sysctl.conf
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_timestamps = 0

Acti­vate the changes with “sysctl –p” and you’re done.

Fujitsu Siemens E Series Lifebook and some Linux distros

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