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The_Beast 01-03-2013 09:17 AM

Intel PRO/Wireless 3945abg very slow
 
1 Attachment(s)
Hi,

My laptop's wifi is very slow and it appears to be due to the driver or module which is the iwl3945. I'm using Archlinux but have also tested with the latest Linux Mint 14 and get similar results. With wifi dongles I get the expected speed of 6+Mbps which is what my ISP provides, whereas with the Intel 3945 I get about 1Mbps.

I remember getting higher speeds in the past which probably means an update at somepoint messed something. The dongles I compared it to are the TP-Link TL-WN422G and Linksys WUSB54GC. Also here is the output from iwconfig

Code:

wlan0    IEEE 802.11abg  ESSID:"SpeedTouchTG585" 
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:1D:68:6C:9F:33 
          Bit Rate=54 Mb/s  Tx-Power=15 dBm 
          Retry  long limit:7  RTS thr:off  Fragment thr:off
          Power Management:off
          Link Quality=47/70  Signal level=-63 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:1  Missed beacon:0

lo        no wireless extensions.

eth0      no wireless extensions.

wlan1    IEEE 802.11bgn  ESSID:"SpeedTouchTG585" 
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:1D:68:6C:9F:33 
          Bit Rate=36 Mb/s  Tx-Power=20 dBm 
          Retry  long limit:7  RTS thr:off  Fragment thr:off
          Power Management:off
          Link Quality=36/70  Signal level=-74 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:834  Missed beacon:0

and ifconfig:

Code:

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.3  netmask 255.255.255.0  broadcast 192.168.10.255
        inet6 fe80::219:d2ff:fec2:412a  prefixlen 64  scopeid 0x20<link>
        ether 00:19:d2:c2:41:2a  txqueuelen 1000  (Ethernet)
        RX packets 5085  bytes 3728546 (3.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13379  bytes 2689324 (2.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.15  netmask 255.255.255.0  broadcast 192.168.10.255
        inet6 fe80::227:19ff:febe:b582  prefixlen 64  scopeid 0x20<link>
        ether 00:27:19:be:b5:82  txqueuelen 1000  (Ethernet)
        RX packets 36811  bytes 24837866 (23.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 25402  bytes 4281796 (4.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0 is the Intel card. I've also attached my pacman log . My laptop is an HP Compaq NC6320 and everything is updated. Thanks in advance.

The_Beast 01-07-2013 06:21 AM

It turns out the problem was NetworkManager. I disabled it and used wicd instead and now I have the expected speed.

fhleung 01-09-2013 07:43 PM

Could you please tell, I would like to know...

Do you need to install software driver for the FIRST time for the Intel wireless device ?

Thank you :newbie:

The_Beast 01-10-2013 12:30 AM

Quote:

Originally Posted by fhleung (Post 4866598)
Could you please tell, I would like to know...

Do you need to install software driver for the FIRST time for the Intel wireless device ?

Thank you :newbie:

Nop, I just followed the Arch Beginner's Installation guide and all my wifi cards worked out of the box. The only packages I had to install were wireless-tools, wpa_supplicant and dialog for connecting. What distro are you using? The module required for the 3945abg is the iwl3945 which I think is part of the linux-firmware package and does not require installation for arch. Check with lsmod if its loaded:

Code:

lsmod|grep iwl

fhleung 01-11-2013 01:20 AM

Quote:

What distro are you using?
I using:
Gentoo http://www.sysresccd.org/SystemRescueCd_Homepage
Centos 6 / FC / Red Hat Enterprise Linux

The hardware was mini PCI ? You think I able to use it inside Desktop computer with PCI slot (white color) ?

The_Beast 01-11-2013 07:44 PM

I'm not sure, but amazon has it as minipci express which is compatible with pci express or usb, although I don't know how you'd connect it exactly.

Boblebad 02-10-2013 01:00 PM

Hi

What about Linux Mint 13 ??

I have a weird problem after updating with the update-manager ...

When using torrent for dl, it is very slow now, but when using http or ftp it's full speed on 30MBit ..

All the best
Carsten, Denmark

The_Beast 02-10-2013 01:16 PM

It sounds more like a problem with torrents and not hardware or driver specific. You should check to see if torrents are blocked, perhaps by a router, in which case you should enable port forwarding for your torrent client through the router's configuration.

Btw I'm not sure but it might be better for you if you started a new thread. This was marked as solved so others might ignore it.


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