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[Bug 739090] very high ping, vanishes after rmmod / modprobe

https://bugzilla.novell.com/show_bug.cgi?id=739090

https://bugzilla.novell.com/show_bug.cgi?id=739090#c1


--- Comment #1 from rens groenewegen <rens.groenewegen@xxxxxxxxx> 2012-01-02
00:35:45 UTC ---
did some more testing.
at first I thought disabling N capability helped, but it does not.

the workaround is to rmmod and modprobe iwlagn, and then the latency problem is
goone.
performance is not stellar, around 3 -4 mbyte per second upload /download, on G
or on N ( I have 2 accesspoints, one with G+N and one on B+G )

this is output from dmesg:

[ 1302.904681] sd 0:0:0:0: [sda] Starting disk
[ 1302.904717] iwlagn 0000:02:00.0: RF_KILL bit toggled to enable radio.
[ 1302.904733] xhci_hcd 0000:03:00.0: setting latency timer to 64
[ 1302.904786] atl1c 0000:04:00.0: wake-up capability disabled by ACPI
[ 1302.904792] atl1c 0000:04:00.0: PME# disabled
[ 1303.056853] Extended CMOS year: 2000
[ 1303.154502] usb 2-1.5: reset full speed USB device number 3 using ehci_hcd
[ 1303.230238] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 1303.249227] btusb 2-1.5:1.0: no reset_resume for driver btusb?
[ 1303.249234] btusb 2-1.5:1.1: no reset_resume for driver btusb?
[ 1303.264181] ata2.00: configured for UDMA/100
[ 1303.318263] usb 1-1.4: reset high speed USB device number 3 using ehci_hcd
[ 1306.241739] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 1306.243011] ata1.00: ACPI cmd ef/5a:00:00:00:00:a0 (SET FEATURES) succeeded
[ 1306.245514] ata1.00: ACPI cmd ef/5a:00:00:00:00:a0 (SET FEATURES) succeeded
[ 1306.246476] ata1.00: configured for UDMA/133
[ 1306.282231] PM: resume of devices complete after 3382.832 msecs
[ 1306.282523] PM: Finishing wakeup.
[ 1306.282524] Restarting tasks ... done.
[ 1306.289580] video LNXVIDEO:00: Restoring backlight state
[ 1306.353639] usb 1-1.5: new high speed USB device number 5 using ehci_hcd
[ 1306.390091] Disabling lock debugging due to kernel taint
[ 1306.391346] ndiswrapper version 1.56 loaded (smp=yes, preempt=no)
[ 1306.704125] usb 1-1.5: New USB device found, idVendor=0bda, idProduct=0138
[ 1306.704135] usb 1-1.5: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 1306.704137] usb 1-1.5: Product: USB2.0-CRW
[ 1306.704139] usb 1-1.5: Manufacturer: Generic
[ 1306.704140] usb 1-1.5: SerialNumber: 20090516388200000
[ 1306.727308] scsi7 : usb-storage 1-1.5:1.0
[ 1306.740313] usb 1-1.5: USB disconnect, device number 5
[ 1306.758207] usbcore: registered new interface driver ndiswrapper
[ 1309.038946] xhci_hcd 0000:03:00.0: PME# enabled
[ 1309.077072] EXT4-fs (sda7): re-mounted. Opts:
user_xattr,acl,barrier=1,stripe=4,data=ordered,commit=600
[ 1309.343932] EXT4-fs (sda7): re-mounted. Opts: acl,user_xattr,commit=600
[ 1309.399849] atl1c 0000:04:00.0: irq 49 for MSI/MSI-X
[ 1309.482493] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 1309.489517] iwlagn 0000:02:00.0: L1 Enabled; Disabling L0S
[ 1309.496238] iwlagn 0000:02:00.0: Radio type=0x2-0x2-0x1
[ 1309.592852] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1311.314170] wlan0: authenticate with bc:05:43:8e:6f:7f (try 1)
[ 1311.316980] wlan0: authenticated
[ 1311.338514] wlan0: associate with bc:05:43:8e:6f:7f (try 1)
[ 1311.341604] wlan0: RX AssocResp from bc:05:43:8e:6f:7f (capab=0x431 status=0
aid=2)
[ 1311.341607] wlan0: associated
[ 1311.345021] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1313.079534] ehci_hcd 0000:00:1a.0: PCI INT A disabled
[ 1313.079576] ehci_hcd 0000:00:1a.0: PME# enabled
[ 1313.079633] ehci_hcd 0000:00:1d.0: PCI INT A disabled
[ 1313.079668] ehci_hcd 0000:00:1d.0: PME# enabled
[ 1321.570857] wlan0: no IPv6 routers present
[ 1345.599782] wlan0: deauthenticating from bc:05:43:8e:6f:7f by local choice
(reason=3)
[ 1345.607296] cfg80211: Calling CRDA to update world regulatory domain
[ 1345.612282] cfg80211: World regulatory domain updated:
[ 1345.612285] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 1345.612288] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1345.612290] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi,
2000 mBm)
[ 1345.612292] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi,
2000 mBm)
[ 1345.612294] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1345.612296] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1345.902757] wlan0: authenticate with 00:50:7f:60:e8:70 (try 1)
[ 1345.904397] wlan0: authenticated
[ 1345.916031] wlan0: associate with 00:50:7f:60:e8:70 (try 1)
[ 1345.921166] wlan0: RX AssocResp from 00:50:7f:60:e8:70 (capab=0x431 status=0
aid=1)
[ 1345.921171] wlan0: associated
[ 1345.926262] cfg80211: Calling CRDA for country: TW
[ 1345.928895] cfg80211: Regulatory domain changed to country: TW
[ 1345.928898] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 1345.928901] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi,
2700 mBm)
[ 1345.928903] cfg80211: (5270000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi,
1700 mBm)
[ 1345.928906] cfg80211: (5735000 KHz - 5815000 KHz @ 40000 KHz), (300 mBi,
3000 mBm)
[ 1390.556430] wlan0: deauthenticating from 00:50:7f:60:e8:70 by local choice
(reason=3)
[ 1390.580175] cfg80211: Calling CRDA to update world regulatory domain
[ 1390.719932] cfg80211: World regulatory domain updated:
[ 1390.719935] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 1390.719937] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1390.719940] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi,
2000 mBm)
[ 1390.719942] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi,
2000 mBm)
[ 1390.719943] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1390.719945] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi,
2000 mBm)
[ 1390.720829] iwlagn 0000:02:00.0: PCI INT A disabled
[ 1394.531362] Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:d
[ 1394.531366] Copyright(c) 2003-2011 Intel Corporation
[ 1394.531455] iwlagn 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 1394.531519] iwlagn 0000:02:00.0: setting latency timer to 64
[ 1394.531565] iwlagn 0000:02:00.0: pci_resource_len = 0x00002000
[ 1394.531567] iwlagn 0000:02:00.0: pci_resource_base = ffffc90001cbc000
[ 1394.531569] iwlagn 0000:02:00.0: HW Revision ID = 0x34
[ 1394.531908] iwlagn 0000:02:00.0: irq 48 for MSI/MSI-X
[ 1394.532026] iwlagn 0000:02:00.0: Detected Intel(R) Centrino(R) Wireless-N
1030 BGN, REV=0xB0
[ 1394.532189] iwlagn 0000:02:00.0: L1 Enabled; Disabling L0S
[ 1394.549345] iwlagn 0000:02:00.0: device EEPROM VER=0x71a, CALIB=0x6
[ 1394.549348] iwlagn 0000:02:00.0: Device SKU: 0X150
[ 1394.549350] iwlagn 0000:02:00.0: Valid Tx ant: 0X1, Valid Rx ant: 0X3
[ 1394.549367] iwlagn 0000:02:00.0: Tunable channels: 13 802.11bg, 0 802.11a
channels
[ 1394.551642] iwlagn 0000:02:00.0: loaded firmware version 17.168.5.1 build
33993
[ 1394.551841] Registered led device: phy3-led
[ 1394.551942] ieee80211 phy3: Selected rate control algorithm 'iwl-agn-rs'
[ 1394.578333] iwlagn 0000:02:00.0: L1 Enabled; Disabling L0S
[ 1394.585035] iwlagn 0000:02:00.0: Radio type=0x2-0x2-0x1
[ 1394.674976] iwlagn 0000:02:00.0: L1 Enabled; Disabling L0S
[ 1394.681667] iwlagn 0000:02:00.0: Radio type=0x2-0x2-0x1
[ 1394.782262] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1397.029831] wlan0: authenticate with 00:50:7f:60:e8:70 (try 1)
[ 1397.031650] wlan0: authenticated
[ 1397.051016] wlan0: associate with 00:50:7f:60:e8:70 (try 1)
[ 1397.053589] wlan0: RX AssocResp from 00:50:7f:60:e8:70 (capab=0x431 status=0
aid=1)
[ 1397.053592] wlan0: associated
[ 1397.060046] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1397.060115] cfg80211: Calling CRDA for country: TW
[ 1397.063040] cfg80211: Regulatory domain changed to country: TW
[ 1397.063042] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 1397.063044] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi,
2700 mBm)
[ 1397.063045] cfg80211: (5270000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi,
1700 mBm)
[ 1397.063047] cfg80211: (5735000 KHz - 5815000 KHz @ 40000 KHz), (300 mBi,
3000 mBm)
[ 1407.730534] wlan0: no IPv6 routers present
l

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