Red Hat Bugzilla – Bug 806563
Wifi connection speed is very slow (intel PRO/Wireless 4945 AGN)
Last modified: 2012-04-22 15:59:46 EDT
Also, seems I get Tx excessive retries:
wlan0 IEEE 802.11abgn ESSID:"house"
Mode:Managed Frequency:2.437 GHz Access Point: C0:3F:0E:F9:AE:4B
Bit Rate=144.4 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Link Quality=46/70 Signal level=-64 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2435 Invalid misc:24 Missed beacon:0
Maybe a regresion of bug #708747 ?
Confirming the regression. If I put
options iwl4965 11n_disable=1 in /etc/modprobe.d/iwl4965-disable11n.conf
solved the problem here
If this is regression please provide the latest kernel version you know that it work.
So, what is the latest working kernel version ?
Sorry for the delay Stanislaw.
This never worked to me since I installed F17.
Unfortunately, In this machine I switch directly from F15 (kernel-220.127.116.11-1.fc15) to a clean F17 snapshop installation.
Ok, 2.6.42 is renamed 3.2, so this is 3.2 -> 3.3 regression. Can remove temporally 11n_disable option and provide dmesg, I would like to see if there is some obvious reason of breakage.
Created attachment 574389 [details]
There is no information in dmesg which indicate any problem.
Also "Tx excessive retries" do not indicate any particular problem, i.e. I have lot of them and performance on my 4965 is good.
I wonder if this is problem caused by kernel change or some other things change that bug can be observable on f17 and was not on f15.
Could you install 3.2 f16 kernel, and check if it do not have this problem. You could download this kernel:
and install it with "rpm -ivh --force"
Also I need some more information about your wireless connection: AP model, it's configuration like security settings, channel used, anything that could be useful to reproduce the issue.
Please provide info requested in above comment.
Sorry for the delay, I was in holidays
I tried 3.2 f16 kernel, but the problem persist. I also tried the latest 2.6 from fc15 and It works without problems.
AP model: netgear CG3300D: http://support.netgear.com/app/products/model/a_id/12788
security: WPA2 / CCMP (AES)
Sorry, the AP model is a Netgear VMDG280, the one provided by Virgin in UK.
(In reply to comment #10)
>I also tried the latest 2.6
> from fc15 and It works without problems.
Which 2.6.y exacly ?
Did you use it on f17 user space ?
I just realized that VMDG280 are available on eBay with very low price, so I'll order one.
(In reply to comment #13)
> Did you use it on f17 user space ?
The version is kernel-18.104.22.168-2.fc15 ( http://koji.fedoraproject.org/koji/buildinfo?buildID=311365 )
I updated to a new kernel (3.3.1-5) and the problem seems to be fixed here. I can try olders kernel to know exactly when It gets fixed if you want.
Feel free to close this bug report and thanks for your support.
Hmm, I just win the VMDG280 bid on ebay, so I'll have yet another AP for testing, however I wish to collect APs that do not work with linux wireless stack.
Anyway, I'm happy it works :-)
One more question just in case, did you remove 11n_disable=1 option on new kernel?
(In reply to comment #16)
> Hmm, I just win the VMDG280 bid on ebay, so I'll have yet another AP for
> testing, however I wish to collect APs that do not work with linux wireless
> Anyway, I'm happy it works :-)
Yeah, me too ;)
> One more question just in case, did you remove 11n_disable=1 option on new
Rechecked only in case today: yeah I have commented the line