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Message #67535
[Bug 1331860] UdevDb.txt
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1331860/+attachment/4134951/+files/UdevDb.txt
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https://bugs.launchpad.net/bugs/1331860
Title:
wireless lags
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Hi,
i already discussed the following issue already in the german forum
http://forum.ubuntuusers.de/topic/netzwerk-lags-nach-kernel-update-3-13-14-04-lt/
and in your Official Ubuntu IRC Support Channel, without a solution.
System:
new Ubuntu: 14.04 LTS
new Kernel: 3.13.0-29-generic
old Ubuntu: 13.10
old Kernel: 3.11.0-19-generic
wireless device: TP-LINK WND4800, Atheros chipset
wireless driver: ath9k
wireless operating mode: 2.4ghz @ 802.11bgn and 5ghz @ 802.11a+n
wireless router: fritz!box 3390
Before upgrading to Ubuntu 14.04 LTS everything worked fine.
After upgrading to Ubuntu 14.04 LTS the wireless connection produced sequently lags, when sending a ping to my wireless router.
The lag sequence duration is around 5 seconds, the duration to the next lag sequence is around 100 seconds.
Each ping get a reply (no requests get lost), but the delay of the reply raises up to 2000 miliseconds.
Normally the ping is around 1 or 2 miliseconds.
I can reproduce this behavior manually by running 'sudo iwlist wlan1 scan' and keep watching the ping in another terminal window.
I also used 'iwevent' to watch on events fired by the wireless interface while the lag is happening:
'01:31:13.289166 wlan1 Scan request completed' is the only message i get.
When booting the 3.11 kernel everything works fine again, no lags occur.
If i try to reproduce the behavior with a manual scan as described before, no lags occur, everything keeps working fine.
I already tried several configurations using special driver options like "nohwcrypt" and "debug", but dmesg and syslog do not log any failures or warnings.
If i downgrade the wireless router to 2.4ghz @ 802.11b+g (54mbit) the new kernel (3.13) has also no failed pings and no massive lags, but this is not a stable solution for me due to many other wireless networks in my environment.
So i assume there has been something changed between the kernel 3.11 and 3.13 or the belonging ath9k driver.
I thought about the wireless scanning interval of the network manager, but i think changing this would also be just a workaround than a clean solution.
Any ideas or recommendations how to solve this or how to collect more relevant information about this issue?
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ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: reiner 3154 F.... pulseaudio
/dev/snd/controlC0: reiner 3154 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=79cac639-2340-43af-8d11-807382480b49
InstallationDate: Installed on 2012-03-17 (824 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: Gigabyte Technology Co., Ltd. GA-MA770-UD3
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=59541979-590e-42ca-a568-79027794148f ro quiet splash
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
RelatedPackageVersions:
linux-restricted-modules-3.13.0-29-generic N/A
linux-backports-modules-3.13.0-29-generic N/A
linux-firmware 1.127.2
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: trusty
Uname: Linux 3.13.0-29-generic i686
UpgradeStatus: Upgraded to trusty on 2014-04-21 (59 days ago)
UserGroups: adm admin cdrom dialout fuse lpadmin mythtv plugdev sambashare wireshark www-data
_MarkForUpload: True
dmi.bios.date: 12/29/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FG
dmi.board.name: GA-MA770-UD3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFG:bd12/29/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA770-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA770-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA770-UD3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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