Linux

Speed regression for Intel Wireless 6230

Bug #1103314 reported by Eric Appleman on 2013-01-23

This bug affects 2 people

Affects		Status	Importance	Assigned to	Milestone
	Linux	Confirmed	Medium	linux-kernel-bugs #53731
	linux (Ubuntu)	Incomplete	Medium	Unassigned

Bug Description

iwlwifi is abyssmally slow in 3.8 compared to 3.7

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-1-generic 3.8.0-1.5
ProcVersionSignature: Ubuntu 3.8.0-1.5-generic 3.8.0-rc4
Uname: Linux 3.8.0-1-generic x86_64
ApportVersion: 2.8-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: eric 2415 F.... pulseaudio
Date: Tue Jan 22 22:40:36 2013
HibernationDevice: RESUME=UUID=65d08ff8-f1b0-4c0e-955b-5e08b2a26ca4
InstallationDate: Installed on 2012-11-26 (57 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: CLEVO CO. W150HRM
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-1-generic root=UUID=bd23af1c-54a5-4540-895b-bd01b2ede3fc ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-1-generic N/A
linux-backports-modules-3.8.0-1-generic N/A
linux-firmware 1.99
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2012-12-03 (50 days ago)
dmi.bios.date: 11/24/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: W150HRM
dmi.board.vendor: CLEVO CO.
dmi.board.version: N/A
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 9
dmi.chassis.vendor: CLEVO CO.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd11/24/2011:svnCLEVOCO.:pnW150HRM:pvrN/A:rvnCLEVOCO.:rnW150HRM:rvrN/A:cvnCLEVOCO.:ct9:cvrN/A:
dmi.product.name: W150HRM
dmi.product.version: N/A
dmi.sys.vendor: CLEVO CO.

Tags:

Revision history for this message

Eric Appleman (erappleman) wrote on 2013-01-23:

AlsaInfo.txt Edit (31.8 KiB, text/plain; charset="utf-8")
BootDmesg.txt Edit (58.8 KiB, text/plain; charset="utf-8")
CRDA.txt Edit (200 bytes, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (20.5 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (3.0 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (516 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (12.8 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (571 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (7.2 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (319 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (4.1 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (3.9 KiB, text/plain; charset="utf-8")
PulseList.txt Edit (22.2 KiB, text/plain; charset="utf-8")
UdevDb.txt Edit (147.1 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (344.9 KiB, text/plain; charset="utf-8")
WifiSyslog.txt Edit (323.8 KiB, text/plain; charset="utf-8")

Revision history for this message

Brad Figg (brad-figg) wrote on 2013-01-23: Status changed to Confirmed

This change was made by a bot.

Changed in linux (Ubuntu):
status:	New → Confirmed

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2013-01-23:

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.8 kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8-rc4-raring/

Changed in linux (Ubuntu):
importance:	Undecided → Medium
tags:	added: needs-bisect
Changed in linux (Ubuntu):
status:	Confirmed → Incomplete

Revision history for this message

Eric Appleman (erappleman) wrote on 2013-01-26:

Confirming with mainline kernel

Linux gensokyo 3.8.0-999-generic #201301250408 SMP Fri Jan 25 09:09:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Revision history for this message

Eric Appleman (erappleman) wrote on 2013-01-26:

Speed comparison

3.7: 84Mbps/40
3.8: 3Mbps/1

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2013-01-28:

Can you see if the latest Raring kernel still exhibits this bug if wireless N is disabled? Ths can be done by setting:

options iwlwifi 11n_disable=1
in
/etc/modprobe.d/iwlwifi.conf

Revision history for this message

Eric Appleman (erappleman) wrote on 2013-01-30:

Confirming that disabling n-mode is a valid workaround.

But I'm curious as to why this rate control bug keeps coming back once every few kernel releases.

Bug Watch Updater (bug-watch-updater) on 2013-02-13

Changed in linux:
importance:	Unknown → Medium
status:	Unknown → Confirmed

Revision history for this message

joehill (joseph-hill) wrote on 2013-05-08:

This became an issue for me too as soon as I upgraded to Raring. I have the "Intel Centrino Advanced-N 6205 Wireless" chip. Because I wasn't sure if this is the same chipset and bug, I filed a new bug, possibly a dupe, here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1177591. I also confirm that disabling n and rebooting restores normal speed.