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Old 01-03-2013, 09:17 AM   #1
The_Beast
LQ Newbie
 
Registered: Mar 2008
Distribution: Archlinux
Posts: 29

Rep: Reputation: 15
Intel PRO/Wireless 3945abg very slow


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.
Attached Files
File Type: log pacman.log (166.5 KB, 9 views)
 
Old 01-07-2013, 06:21 AM   #2
The_Beast
LQ Newbie
 
Registered: Mar 2008
Distribution: Archlinux
Posts: 29

Original Poster
Rep: Reputation: 15
It turns out the problem was NetworkManager. I disabled it and used wicd instead and now I have the expected speed.
 
Old 01-09-2013, 07:43 PM   #3
fhleung
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Registered: Aug 2004
Distribution: Fedora, Debian
Posts: 333

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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
 
Old 01-10-2013, 12:30 AM   #4
The_Beast
LQ Newbie
 
Registered: Mar 2008
Distribution: Archlinux
Posts: 29

Original Poster
Rep: Reputation: 15
Quote:
Originally Posted by fhleung View Post
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
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
 
Old 01-11-2013, 01:20 AM   #5
fhleung
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Registered: Aug 2004
Distribution: Fedora, Debian
Posts: 333

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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) ?
 
Old 01-11-2013, 07:44 PM   #6
The_Beast
LQ Newbie
 
Registered: Mar 2008
Distribution: Archlinux
Posts: 29

Original Poster
Rep: Reputation: 15
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.
 
Old 02-10-2013, 01:00 PM   #7
Boblebad
LQ Newbie
 
Registered: Feb 2013
Posts: 1

Rep: Reputation: Disabled
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
 
Old 02-10-2013, 01:16 PM   #8
The_Beast
LQ Newbie
 
Registered: Mar 2008
Distribution: Archlinux
Posts: 29

Original Poster
Rep: Reputation: 15
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.

Last edited by The_Beast; 02-10-2013 at 01:20 PM.
 
  


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