[SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

dxtrpn · 2012-01-24 01:02:36

I'm working to resolve an issue I've been experiencing on my laptop. My wireless internet is unacceptably slow- here are some test results via speedtest.net-

[arch/kde/konqueror]: 

1. ping: 19 ms / download speed: 2.22 mbps / upload speed: 0.18 mbps
2. ping: 45 ms / download speed: 0.59 mbps / upload speed: 0.39 mbps
3. ping: 40 ms / download speed: 3.07 mbps / upload speed: 0.96 mbps
4. ping: 38 ms / download speed: 1.01 mbps / upload speed: 0.48 mbps
5. ping: 40 ms / download speed: 3.07 mbps / upload speed: 0.93 mbps

vs. this, on a four year old spare laptop running windows vista-

[spare laptop/windows vista/firefox]

1. ping: 17 ms / download speed: 11.41 mbps / upload speed: 0.84 mbps
2. ping: 19 ms / download speed: 10.61 mbps / upload speed: 0.85 mbps
3. ping: 18 ms / download speed: 12.44 mbps / upload speed: 0.82 mbps
4. ping: 18 ms / download speed:  9.94 mbps / upload speed: 0.82 mbps
5. ping: 20 ms / download speed: 10.14 mbps / upload speed: 0.85 mbps

Here is a link to my discussion of the issue on reddit.

Anyway, are there any further troubleshooting activities one would recommend? I'd be glad to work along with someone to figure this thing out!

[EDIT] It was a reception problem. Thanks for the input!

Last edited by dxtrpn (2012-01-26 23:21:10)

ajaxas · 2012-01-24 05:22:26

How about this:

To fix the problem, create a file called "/etc/modprobe.d/ath9k.conf", containing the line "options ath9k nohwcrypt=1"

People report this solves slow connection problem.

Btw, is your connection reported as 802.11n or only 802.11g?

[ajaxas@r2d2 ~]$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"ayanet"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: E0:91:F5:7D:E4:44   
          Bit Rate=54 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=59/70  Signal level=-51 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:16   Missed beacon:0

This is wrong.

dxtrpn · 2012-01-25 02:37:20

Hey, thanks for the tip!
I tried adding the bit to modprobe.d, but no results. I believe the issue is with encryption, and this is why:
Until recently, I'd used WEP, but had to change it to WAP2 . I noticed issues shortly afterward, and just today, I fiddled around some more. Unencrypted download speed came in around 17-20 mpbs, WEP was 9-13. But, somewhat unfortunately, when I switched back to WAP2 to confirm the issue, I connected at about the same speed as the other encryptions. So it seems to be faster now, but I can't say why.
I suppose another explanation would be that changing the type of encryption reset something that needed resetting with my router.
Any input is welcome.

Here is this-

# iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"onliner"  
              Mode:Managed  Frequency:2.417 GHz  Access Point: C4:3D:C7:92:07:2C   
              Bit Rate=135 Mb/s   Tx-Power=14 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:on
              Link Quality=70/70  Signal level=-38 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:24  Invalid misc:2792   Missed beacon:0

So, what about this is wrong?

Last edited by dxtrpn (2012-01-25 03:05:47)

Zenettii · 2012-01-26 22:40:28

Been bugging me for a couple of days now. I'm wanting to blame it on a recent update since I don't remember having touched anything to do with my wifi recently.
When I connect via cable its all great. go to wifi and all a sudden I'm pinging my router at anything from 1.xxms to 1882ms.
routing/resolv.conf/static IP setup is all the same on both interfaces.

Tried the above recommendation but made no difference.

$ iwconfig wlan0
wlan0 IEEE 802.11bgn ESSID:"Treehouse1"
Mode:Managed Frequency:2.472 GHz Access Point: 00:1C:DF:E4:34:53
Bit Rate=108 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=70/70 Signal level=-34 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:520 Invalid misc:7 Missed beacon:0

ajaxas · 2012-01-27 06:57:44

dxtrpn wrote:

Here is this-

# iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"onliner"  
              Mode:Managed  Frequency:2.417 GHz  Access Point: C4:3D:C7:92:07:2C   
              Bit Rate=135 Mb/s   Tx-Power=14 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:on
              Link Quality=70/70  Signal level=-38 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:24  Invalid misc:2792   Missed beacon:0

So, what about this is wrong?

In my case it's connected at 54 Mb/s. It's 802.11g, not n. That's what's wrong.

Arch Linux

#1 2012-01-24 01:02:36

[SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

#2 2012-01-24 05:22:26

Re: [SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

#3 2012-01-25 02:37:20

Re: [SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

#4 2012-01-26 22:40:28

Re: [SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

#5 2012-01-27 06:57:44

Re: [SOLVED] Troubleshooting slow wireless [ath9k/samsung r540 laptop]

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