New Router Connection Speeds Redux

After achieving some success with improved 802.11n connection speeds, I found some help with providing a dramatic increase with those speeds.

Apparently the iwlwifi driver is not so well designed.

The following change to /etc/modprobe.d/iwlwifi.conf was the trick.

options iwlwifi 11n_disable=8

With that change I again tested iperf.

With 2.4 GHz:

From laptop to server: ~33 Mbps

From server to laptop: ~50 Mbps

With 5 GHz:

From laptop to server: ~61 Mbps

From server to laptop: ~95 Mbps

Before the change I was seeing ~45 Mbps from server to laptop using 5 GHz. The improvement is double.

Removing that iwlwifi option returns the system to the same dismal results.

Allegedly there is some kind of trade-off between “stability” and speed. Thus far I notice no packet drops or connectivity problems.

Interesting that I still see significant differences depending on which direction I run the iperf test. That is, at least on Ubuntu MATE. When I reboot into Slackware I see ~95 Mbps in both directions. Perhaps this is Yet Another Paper Cut in Ubuntu.

Thumping away at about 95 Mbps is better than what could be expected with 10/100 Mbps ethernet.

Too bad the developer does not want or won’t fix the problem in a more seamless manner. That is the world of free/libre software — something is always broken.

Posted: Category: Usability Tagged: DD-WRT

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