| View previous topic :: View next topic |
| Author |
Message |
Tazmanian
Apprentice
Joined: 01 Jul 2003
Posts: 222
|
 Posted: Fri Mar 20, 2009 8:28 am Post subject: iwlagn wireless driver: slow connection on 802.11b [SOLVED] |
 |
|
I'm getting very bad network performance with my Intel 4965 AGN wireless adapter. According to speedtest.net, I'm getting download speeds of ~550 kbit/s, while I see ~4200 kbit/s on another laptop (also running Gentoo) on the same network, sitting right beside this one. Does anyone know what's going on?
Here are some details.
- Lenovo X300 laptop
- 802.11b network with 128-bit WEP
- lspci: Intel Corporation PRO/Wireless 4965 AG or AGN Network Connection (rev 61)
- lsmod: iwlagn, iwlcore, mac80211
- gentoo-sources-2.6.27-r8
- iwl4965-ucode-228.57.2.21
| Code: | # iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"..."
Mode:Managed Frequency:2.462 GHz Access Point: ...
Bit Rate=11 Mb/s Tx-Power=14 dBm
Retry limit:7 RTS thr:off Fragment thr=2352 B
Encryption key:... Security mode:open
Power Management:off
Link Quality=87/100 Signal level:-57 dBm Noise level=-92 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
|
| Code: | .config - Linux Kernel v2.6.27-gentoo-r8 Configuration
──────────────────────────────────────────────────────────────────────────────
┌───────────────────────────── Wireless LAN ──────────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus --->. │
│ Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, │
│ <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> │
│ for Search. Legend: [*] built-in [ ] excluded <M> module < > │
│ ┌─────────────────────────────────────────────────────────────────────┐ │
│ │ [ ] Wireless LAN (pre-802.11) │ │
│ │ [*] Wireless LAN (IEEE 802.11) │ │
│ │ < > Intel PRO/Wireless 2100 Network Connection │ │
│ │ < > Intel PRO/Wireless 2200BG and 2915ABG Network Connection │ │
│ │ < > Marvell 8xxx Libertas WLAN driver support │ │
│ │ < > Cisco/Aironet 34X/35X/4500/4800 ISA and PCI cards │ │
│ │ < > Hermes chipset 802.11b support (Orinoco/Prism2/Symbol) │ │
│ │ < > Atmel at76c50x chipset 802.11b support │ │
│ │ < > Intersil Prism GT/Duette/Indigo PCI/Cardbus │ │
│ │ < > USB ZD1201 based Wireless device support │ │
│ │ < > Wireless RNDIS USB support │ │
│ │ < > Realtek 8180/8185 PCI support │ │
│ │ < > Realtek 8187 and 8187B USB support │ │
│ │ < > ADMtek ADM8211 support │ │
│ │ < > Simulated radio testing tool for mac80211 │ │
│ │ < > Softmac Prism54 support │ │
│ │ < > Atheros 5xxx wireless cards support │ │
│ │ < > Atheros 802.11n wireless cards support │ │
│ │ -M- Intel Wireless Wifi Core │ │
│ │ [*] Iwlwifi RF kill support │ │
│ │ [ ] Enable full debugging output in iwlagn driver │ │
│ │ <M> Intel Wireless WiFi Next Gen AGN │ │
│ │ [*] Enable Spectrum Measurement in iwlagn driver │ │
│ │ [*] Enable LEDS features in iwlagn driver │ │
│ │ [*] Intel Wireless WiFi 4965AGN │ │
│ │ [ ] Intel Wireless WiFi 5000AGN │ │
│ │ < > Intel PRO/Wireless 3945ABG/BG Network Connection │ │
│ │ < > IEEE 802.11 for Host AP (Prism2/2.5/3 and WEP/TKIP/CCMP) │ │
│ │ < > Broadcom 43xx wireless support (mac80211 stack) │ │
│ │ < > Broadcom 43xx-legacy wireless support (mac80211 stack) │ │
│ │ < > ZyDAS ZD1211/ZD1211B USB-wireless support │ │
│ │ < > Ralink driver support │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ └─────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────┘
|
Last edited by Tazmanian on Sat Mar 21, 2009 7:19 pm; edited 1 time in total |
|
| Back to top |
|
 |
mamac
l33t
Joined: 29 Feb 2004
Posts: 890
|
| Posted: Fri Mar 20, 2009 10:57 am Post subject: |
|
|
Hi,
Are the others also on 11 Mb/s ?
_________________
Powered by Gentoo Linux since 2003 |
|
| Back to top |
|
|
d2_racing
Bodhisattva
Joined: 25 Apr 2005
Posts: 13047
Location: Ste-Foy,Canada
|
| Posted: Fri Mar 20, 2009 11:44 am Post subject: |
|
|
In fact, your AP seems to be stuck at 11 MB.
Also, what happen when you download something and you run this :
| Code: |
# dmesg | grep -i iwl
|
|
|
| Back to top |
|
|
Tazmanian
Apprentice
Joined: 01 Jul 2003
Posts: 222
|
| Posted: Fri Mar 20, 2009 6:32 pm Post subject: |
|
|
Hi, thanks for your responses.
The AP is running 802.11b, so 11 Mb/s is the most anyone will ever get on this network. For sanity, here's what I have on the other laptop, which has an "Atheros Communications Inc. AR5212 802.11abg NIC (rev 01)":
| Code: | # iwconfig ath0
ath0 IEEE 802.11b ESSID:"..." Nickname:""
Mode:Managed Frequency:2.462 GHz Access Point: ...
Bit Rate:11 Mb/s Tx-Power:17 dBm Sensitivity=1/1
Retry:off RTS thr:off Fragment thr:off
Encryption key:... Security mode:restricted
Power Management:off
Link Quality=26/70 Signal level=-71 dBm Noise level=-97 dBm
Rx invalid nwid:1503741 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0 |
Going back to the laptop with the Intel card, here is what I get in dmesg before downloading a 2 MB file. No new related messages appear during the download.
| Code: | $ dmesg|egrep '(iwl|wlan)'
iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27ks
iwlagn: Copyright(c) 2003-2008 Intel Corporation
iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
iwlagn 0000:03:00.0: setting latency timer to 64
iwlagn: Detected Intel Wireless WiFi Link 4965AGN REV=0x4
iwlagn: Tunable channels: 11 802.11bg, 13 802.11a channels
iwlagn 0000:03:00.0: PCI INT A disabled
phy0: Selected rate control algorithm 'iwl-agn-rs'
iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
iwlagn 0000:03:00.0: restoring config space at offset 0x1 (was 0x40100102, writing 0x40100106)
firmware: requesting iwlwifi-4965-2.ucode
Registered led device: iwl-phy0:radio
Registered led device: iwl-phy0:assoc
Registered led device: iwl-phy0:RX
Registered led device: iwl-phy0:TX
wlan0: authenticate with AP [mac]
wlan0: authenticated
wlan0: associate with AP [mac]
wlan0: RX AssocResp from [mac] (capab=0x15 status=0 aid=14)
wlan0: associated |
|
|
| Back to top |
|
|
Tazmanian
Apprentice
Joined: 01 Jul 2003
Posts: 222
|
| Posted: Sat Mar 21, 2009 7:18 pm Post subject: |
|
|
I've solved the problem. It looks like people on other distros have also been experiencing problems with network throughput on 802.11b networks with the iwlagn driver. Downloading and installing the latest iwlagn drivers from http://linuxwireless.org/en/users/Download fixes the problem.
Thanks! |
|
| Back to top |
|
|
d2_racing
Bodhisattva
Joined: 25 Apr 2005
Posts: 13047
Location: Ste-Foy,Canada
|
| Posted: Sun Mar 22, 2009 12:22 am Post subject: |
|
|
Nice  |
|
| Back to top |
|
|
|
Networking & Security
