I confirm this issue. In my case there is a huge regression in uplink
speed with kernel 3.11.0-15-generic compared to 3.11.0-12-generic (which
is good).
With 3.11.0-15-generic, I only get sustained 400–500KB/s uplink speed
(downlink speed is better though).
With 3.11.0-12-generic the uplink speed is over 7MB/s sustained (and
over 11MB/s downlink rate).
I have an Asus RT-AC66U router with N-capabilities, but no tweaking on
router helps on the iwlwifi speed problem when running the
3.11.0-15-generic kernel. I also see the problem with other access
points.
My wifi card:
description: Wireless interface
product: Centrino Advanced-N 6200
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 35
serial: 00:23:14:a8:0e:c0
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical
wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=3.11.0-12-generic firmware=9.221.4.1 build 25532 ip=192.168.1.100
latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
resources: irq:44 memory:d6e00000-d6e01fff
wlan0 IEEE 802.11abgn ESSID:"Kaffefilter5G"
Mode:Managed Frequency:5.2 GHz Access Point: BC:EE:7B:7C:DC:E4
Bit Rate=6 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=64/70 Signal level=-46 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:290304 Invalid misc:65 Missed beacon:0
No special iwlwifi module options. Fully updated Ubuntu 13.10 x86-64.
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1270208
Title:
linux-image-3.11.0-15-generic appears to regress connection speed for
iwlwifi
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
I recently installed 13.10 and immediately updated to the latest
updates via my ethernet work connection.
Got home and noted that linux-image-3.11.0-15-generic was only able to
transfer to my local media box via wifi at ~350kB/s (ie. Taking 10+
minutes for a 300Mb file)
After trawling the net for a while, the usual solution appeared to be
"restart with 11n_disable=1 as a module option."
That didn't solve the issue not did several other suggestions. So I
reverted to the other kernal installed on my system linux-
image-3.11.0-12-generic
After booting that kernel my transfer speeds are ~3MB/s - much saner
(though I have had things configured so I get closer to 6MB/s)
Not sure what other info I can provide.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified:
boot/vmlinuz-3.11.0-12-generic]
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: carlos 2193 F.... pulseaudio
/dev/snd/controlC0: carlos 2193 F.... pulseaudio
Date: Fri Jan 17 23:59:56 2014
HibernationDevice: RESUME=UUID=0fbe8395-5e8d-430f-823c-b5408451c73e
InstallationDate: Installed on 2014-01-14 (3 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64
(20131016.1)
MachineType: Dell Inc. Latitude E6520
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_AU:en
TERM=xterm
PATH=(custom, no user)
LANG=en_AU.UTF-8
SHELL=/bin/bash
ProcFB:
0 inteldrmfb
1 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic
root=UUID=22c75466-3cb5-416a-9513-8debe4246bcd ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.11.0-12-generic N/A
linux-backports-modules-3.11.0-12-generic N/A
linux-firmware 1.116
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0J4TFW
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA14:bd07/11/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0J4TFW:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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