wireless network in maverick (10.10) and natty (11.04) painfully slow
I have a DLink PCIe W-LAN card which uses the Atheros chip and the ath9k driver.
I was running lucid (10.04) and had wonderful wireless network performance. For example I downloaded the 648Mbyte natty LiveCD in a little over 3 minutes.
I then used the upgrade manager to upgrade to maverick (10.10) and then natty (11.04). After the upgrade to maverick, downloading the natty updates took an extremely long time - over an hour. After the upgrade to natty, I continue to have painfully slow networking so much so that I would like to go downgrade back to lucid.
Here are the speedtest.net results. All in Mbps.
11.04 W-LAN (ath9k) 4 - 5 | 21
11.04 wired 38.2 | 22.2
Windows 7 notebook 29.97 | 22.67
on same W-LAN
in same room
I looked at all the articles I could find about slow networking in Ubuntu. Discounting the ones relating to lucid or earlier, I found only 3 suggestions:
- disable ipv6. It is already disabled. In the ipv6 settings dialog Method: ignore is set.
- a problem with "cifs". Since speedtest.net does not use Samba, I do not think cifs has anything to do with it.
- try restarting the router. Did that; didn't help
One person who reported a slow network added a later note that he had a problem with his line filter. Well the 2nd and 3rd results above indicate that I have no such problem.
When I ping my router, I get 20% packet loss. This and the much faster upload speed suggests ath9k driver or some other part of the W-LAN network stack is dropping incoming packets.
An obvious conclusion one might make from the above information is that my W-LAN card has a problem. However the chance of it breaking at exactly the moment I upgraded to maverick is so remote as to be unbelievable. It looks to me like a bug but before reporting it, I thought I would ask here. Has anyone else had similar problems? Is there some network configuration setting that was changed in maverick/natty compared to lucid.
Just to be clear, I changed absolutely nothing else in my home network setup. I did not even power off the router. I simply upgraded the Ubuntu box's software and the network performance disappeared.
Question information
- Language:
- English Edit question
- Status:
- Solved
- Assignee:
- No assignee Edit question
- Solved by:
- Mark
- Solved:
- Last query:
- Last reply: