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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https://bugs.launchpad.net/bugs/1270208
Title:
linux-image-3.11.0-15-generic appears to regress connection speed for
iwlwifi
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