Kernel regression : iwl-legacy/4965 not performing well with 4965AGN.

Hey guys I just updated the kernel26 package via pacman not too long ago and noticed after upgrade I had worse than usual wireless performance.
I upgraded from 2.6.38-ARCH to 2.6.39-ARCH.
Heres an output of iwconfig :
wlan0 IEEE 802.11abgn ESSID:"MySSID"
Mode:Managed Frequency:2.412 GHz Access Point: MyMac
Bit Rate=24 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=55/70 Signal level=-55 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:5 Invalid misc:33419 Missed beacon:0
I notice that there is a large Invalid misc value and the connection even had a couple of Tx excessive retry errors, I also notice that my wireless bandwidth is quite weak (I had a G rate of 54 Mb/s pre upgrade). I used speedtest.net to check my internet speed and noted that my connection speed had halved (7 mbit as opposed to 15).
Oh and if this helps here is an output of dmesg |grep 4965 :
[ 5.842556] iwl4965: Intel(R) Wireless WiFi 4965 driver for Linux, in-tree:
[ 5.842578] iwl4965: Copyright(c) 2003-2011 Intel Corporation
[ 5.842580] Registering 4965 rate control operations
[ 5.842643] iwl4965 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 5.842651] iwl4965 0000:03:00.0: setting latency timer to 64
[ 5.842678] iwl4965 0000:03:00.0: Detected Intel(R) Wireless WiFi Link 4965AGN, REV=0x4
[ 5.915174] iwl4965 0000:03:00.0: device EEPROM VER=0x36, CALIB=0x5
[ 5.915192] iwl4965 0000:03:00.0: Tunable channels: 11 802.11bg, 13 802.11a channels
[ 5.915451] iwl4965 0000:03:00.0: irq 48 for MSI/MSI-X
[ 6.017997] iwl4965 0000:03:00.0: loaded firmware version 228.61.2.24
[ 6.401528] ieee80211 phy0: Selected rate control algorithm 'iwl-4965-rs'
and an output of lspci | grep 4965 :
03:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)
I connect to my network with WPA2(AES) encryption and I'm using NetworkManager for my networking management.
If theres any other info that I should share to help solve this problem please let me know.
(P.S. I'm a new convert to Arch and I've been finding it great!)
-MDstr
Last edited by MDstr (2011-06-13 13:43:24)

djpohly wrote:qelo: what kind of card do you have? Maybe we have a different problem from the OP...?
I have 4965AGN. I can use wifi if I have very good link quality but even then I have many "Tx excessive retries" and "Invalid misc".
$ uname -r
3.0.0-rc3-mainline
wlan0 IEEE 802.11abgn ESSID:"x"
Mode:Managed Frequency:2.427 GHz Access Point: xx:xx:xx:xx:xx:xx
Bit Rate=13 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=37/70 Signal level=-73 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:12688 Invalid misc:27437 Missed beacon:0
[ 13.522300] iwl4965: Intel(R) Wireless WiFi 4965 driver for Linux, in-tree:
[ 13.522369] iwl4965: Copyright(c) 2003-2011 Intel Corporation
[ 13.522503] iwl4965 0000:04:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 13.522603] iwl4965 0000:04:00.0: Detected Intel(R) Wireless WiFi Link 4965AGN, REV=0x4
[ 13.561536] iwl4965 0000:04:00.0: device EEPROM VER=0x36, CALIB=0x5
[ 13.561613] iwl4965 0000:04:00.0: Tunable channels: 13 802.11bg, 19 802.11a channels
[ 13.989978] iwl4965 0000:04:00.0: loaded firmware version 228.61.2.24
[ 151.653373] iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = xx:xx:xx:xx:xx:xx tid = 0
[ 155.353370] iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = xx:xx:xx:xx:xx:xx tid = 0
[ 276.389009] iwl4965 0000:04:00.0: Aggregation not enabled for tid 6 because load = 1
[ 1190.419959] iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = xx:xx:xx:xx:xx:xx tid = 6
[14916.337475] iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = xx:xx:xx:xx:xx:xx tid = 0
[17726.030890] iwl4965 0000:04:00.0: Aggregation not enabled for tid 6 because load = 0
[21043.402115] iwl4965 0000:04:00.0: Aggregation not enabled for tid 6 because load = 1
[22137.197869] iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = xx:xx:xx:xx:xx:xx tid = 6

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