Ubuntu
linux package

  1. Bug #155393
  2. Comment #51

Comment 51 for bug 155393

Revision history for this message
Christiansen (happylinux) wrote : Re: Internet extremely slow in Gutsy after upgrade

 jamouneau wrote on 2007-11-02

sudo gedit /etc/sysctl.conf
  change the following parameters to 0: (they are already in the list and you only need to change from "1" to "0")
net.ipv4.tcp_sack = 0
net.ipv4.tcp_window_scaling = 0
  save file, reboot

And Ralph Corderoy rewrote this later to this simple command :

sudo sysctl -w net.ipv4.tcp_{window_scaling,timestamps,sack}=0

Thank both, this solved my problem described earlier in this tread immediately, on both Gutsy and Hardy Alpha2 and even without reboot. Clean installations and no fiddling with DNS nor IPv6. I'm now back on the high Internet performance i used to have with Edgy (NetworkMananger didn't work for me in Feisty, so this was a no go)

Can't help wondering what this excactly does ?. But if is it a bug in the default configuration of a out of the box installation of K/Ubuntu, I certainly hope this will be corrected before the final release of Hardy.....

BTW Testet on wireless access