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[Bug 1594148] Re: Intel wireless 6300 ultimate, regression of throughput 12.04 >> 16.04

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** Description changed:

  I submitted a new bug report as the bug #1471794 has a slightly
  different hardware.
  
  I wanted to migrate from Ubuntu 12.04.04 LTS to 16.04 and installed a
  new Ubuntu 16.04 LTS on a second SSD for testing on the same hardware. I
  was not moving my laptop in space during the testing. Both tests were
  performed on battery on 5GHZ wifi connected to a AVM Fritzbox 7490
  router. Ubuntu 12.04.04 showed a throughput of about 180Mbit/s. Ubuntu
  16.04 showed only about 60Mbit/s.
  
  ----------
  
  iperf -c 192.168.10.11 -r -t 30
  ------------------------------------------------------------
  Server listening on TCP port 5001
  TCP window size: 85.3 KByte (default)
  ------------------------------------------------------------
  ------------------------------------------------------------
  Client connecting to 192.168.10.11, TCP port 5001
  TCP window size: 136 KByte (default)
  ------------------------------------------------------------
  [ 5] local 192.168.10.21 port 39466 connected with 192.168.10.11 port 5001
  [ ID] Interval Transfer Bandwidth
  [ 5] 0.0-30.1 sec 125 MBytes 34.8 Mbits/sec
  [ 4] local 192.168.10.21 port 5001 connected with 192.168.10.11 port 60995
  [ 4] 0.0-30.2 sec 206 MBytes 57.1 Mbits/sec
  
  ----------
  
  Complete system:
  Dell Latitude E6400, RAM 4GB, CPU Intel E8400, Network controller: Intel Corporation Centrino Ultimate-N 6300
  
  ----------
  
  What is the full computer model number (ex. HP G32-301TX Notebook PC)?
- Dell Latitude E6400 Notebook, newest Bios A27
+ Dell Latitude E6400 Notebook, newest Bios A34
  
  If you update your BIOS to the newest version following the guide here, does this change anything?
- Already newest BIOS installed 
+ Already newest BIOS installed
  
  Regarding your wireless Access Point (AP):
- 3a. What is the current AP manufacturer, full model, revision, and firmware version? 
+ 3a. What is the current AP manufacturer, full model, revision, and firmware version?
  AVM, Fritzbox 7490, v1, FRITZ!OS:06.51
  
- 3b. If you update the AP to the latest firmware does it change anything? 
+ 3b. If you update the AP to the latest firmware does it change anything?
  Already newest firmware installed.
  
- 3c. What wireless connection type are you using (802.11ac, 802.11n 150/300, 802.11g, etc.)? 
+ 3c. What wireless connection type are you using (802.11ac, 802.11n 150/300, 802.11g, etc.)?
  802.11n with 450Mbit/s 3x3 Mimo, 5GHz
  
- 3d. If you switch to a different wireless type (802.11g or 802.11n if you are using 802.11g) does this change anything? 
+ 3d. If you switch to a different wireless type (802.11g or 802.11n if you are using 802.11g) does this change anything?
  In 802.11n 2.4GHz throughput is also lower
  
- 3e. What channel specifically are you using when this problem is reproducible? 
+ 3e. What channel specifically are you using when this problem is reproducible?
  36
  
  3f. In order to understand the wireless environment your AP is working in, please provide the output of the following terminal command:
  sudo iw dev wlan0 scan | grep -i "ds parameter set"
  sudo iw dev wlp12s0 scan | grep -i "ds parameter set"
-         DS Parameter set: channel 36
-         DS Parameter set: channel 1
-         DS Parameter set: channel 1
-         DS Parameter set: channel 1
-         DS Parameter set: channel 1
-         DS Parameter set: channel 4
-         DS Parameter set: channel 6
-         DS Parameter set: channel 6
-         DS Parameter set: channel 7
-         DS Parameter set: channel 9
-         DS Parameter set: channel 10
-         DS Parameter set: channel 11
-         DS Parameter set: channel 11
-         DS Parameter set: channel 11
-         DS Parameter set: channel 11
-         DS Parameter set: channel 12
-         DS Parameter set: channel 112
+         DS Parameter set: channel 36
+         DS Parameter set: channel 1
+         DS Parameter set: channel 1
+         DS Parameter set: channel 1
+         DS Parameter set: channel 1
+         DS Parameter set: channel 4
+         DS Parameter set: channel 6
+         DS Parameter set: channel 6
+         DS Parameter set: channel 7
+         DS Parameter set: channel 9
+         DS Parameter set: channel 10
+         DS Parameter set: channel 11
+         DS Parameter set: channel 11
+         DS Parameter set: channel 11
+         DS Parameter set: channel 11
+         DS Parameter set: channel 12
+         DS Parameter set: channel 112
  
- 3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)? 
+ 3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
  WPA2-PSK
  
- 3h. If you change and remove encryption entirely does this change anything? 
+ 3h. If you change and remove encryption entirely does this change anything?
  Not tested, because only WPA2 makes sense to get high troughput.
  
- 3i. Do you have QoS (Quality of Service)/WMM (Wi-Fi Multimedia) enabled? 
+ 3i. Do you have QoS (Quality of Service)/WMM (Wi-Fi Multimedia) enabled?
  WMM, Connection properties according to the Fritzbox interface: STBC, TxBF, LDPC, PMF
  
- 3j. If you disable/enable QoS/WMM does it change anything? 
+ 3j. If you disable/enable QoS/WMM does it change anything?
  I dont know how.
  
- 3k. What is the current beacon interval (usually default is 100)? 
+ 3k. What is the current beacon interval (usually default is 100)?
  I dont know how.
  
- 3l. If you adjust this to 50 does it change anything? 
+ 3l. If you adjust this to 50 does it change anything?
  I dont know how.
  
- 3m. Does your AP have a firewall enabled? 
+ 3m. Does your AP have a firewall enabled?
  yes
  
- 3n. If you enable/disable the firewall does it change anything? 
+ 3n. If you enable/disable the firewall does it change anything?
  no
  
- 3o. What frequency are you using (2.4GHz, 5GHz, etc.)? 
+ 3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
  5GHz
  
  3p. If you change frequency does it change anything?
  no
  
  Does another wireless device tested with the AP have the same problem as the hardware you initially reported with?
  no
  
  What is the distance of the wireless device from the AP?
  2.5m
  
  What is the number and type of obstructions between your device and the AP?
  direct sight, no obstructions.
  
  6a. If you bring the device close to the AP and eliminate obstructions, does this change anything?
  no
  
  Does the issue occur with different APs?
  Not tested.
  
  Is it a regression (i.e. did the problem happen in a prior Ubuntu release)? If so, what release specifically did it last work with? If you do not know, could you please test for this in the earliest release of Ubuntu that is supported as per Ubuntu Releases?
- Yes it is a regression. (K)ubuntu 12.04.04 LTS worked well. 
+ Yes it is a regression. (K)ubuntu 12.04.04 LTS worked well.
  Linux X-mobile 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
  
  X@X-mobile:~$ iperf -c 192.168.10.11 -t 30 -r
  ------------------------------------------------------------
  Server listening on TCP port 5001
  TCP window size: 85.3 KByte (default)
  ------------------------------------------------------------
  ------------------------------------------------------------
  Client connecting to 192.168.10.11, TCP port 5001
  TCP window size: 23.5 KByte (default)
  ------------------------------------------------------------
  [ 5] local 192.168.10.21 port 59437 connected with 192.168.10.11 port 5001
  [ ID] Interval Transfer Bandwidth
  [ 5] 0.0-30.0 sec 604 MBytes 169 Mbits/sec
  [ 4] local 192.168.10.21 port 5001 connected with 192.168.10.11 port 32793
  [ 4] 0.0-30.2 sec 668 MBytes 185 Mbits/sec
  
  Could you please test upstream's compat-wireless backports via https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_from_upstream? Please mention in your report the specific version you tested.
  Will follow in next comment (after i restarted)
  
  If the above backport did work, does this problem occur in the newest mainline kernel following https://wiki.ubuntu.com/Kernel/MainlineBuilds? Please mention what specific version of the mainline kernel you tested with in your report.
  -
  
  If the mainline works, does either the development release or the Ubuntu provided stable compat-wireless backport work following https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_in_Ubuntu? Please mention in your report the specific version you tested.
  -
  
  Only for Intel wireless chipsets:
  
  14a. Please advise to which firmware version the device is using. Stating the linux-firmware version (ex. apt-cache policy linux-firmware), while necessary, is not the firmware version in use, but the package version of linux-firwmare. In order to find the version in use, one may check dmesg. For example, if the chipset was using the iwlwifi driver:
  sudo cat /var/log/syslog | grep "firmware version"
  [    5.720248] iwlwifi 0000:0c:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm
  
  ----------
  
  Following questions are answered in later comments.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-24-generic 4.4.0-24.43
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  mellhen    1530 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  mellhen    1530 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sun Jun 19 19:32:08 2016
  HibernationDevice: RESUME=UUID=f43a948f-c937-45e4-b869-77b1bd2ae610
  InstallationDate: Installed on 2016-06-19 (0 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: Dell Inc. Latitude E6400
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-24-generic root=UUID=f93d1069-b1e0-423d-917f-df2e1878d54c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-4.4.0-24-generic N/A
-  linux-backports-modules-4.4.0-24-generic  N/A
-  linux-firmware                            1.157
+  linux-restricted-modules-4.4.0-24-generic N/A
+  linux-backports-modules-4.4.0-24-generic  N/A
+  linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/04/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A34
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA34:bd06/04/2013:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

-- 
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https://bugs.launchpad.net/bugs/1594148

Title:
  Intel wireless 6300 ultimate, regression of throughput 12.04 >> 16.04

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I submitted a new bug report as the bug #1471794 has a slightly
  different hardware.

  I wanted to migrate from Ubuntu 12.04.04 LTS to 16.04 and installed a
  new Ubuntu 16.04 LTS on a second SSD for testing on the same hardware.
  I was not moving my laptop in space during the testing. Both tests
  were performed on battery on 5GHZ wifi connected to a AVM Fritzbox
  7490 router. Ubuntu 12.04.04 showed a throughput of about 180Mbit/s.
  Ubuntu 16.04 showed only about 60Mbit/s.

  ----------

  iperf -c 192.168.10.11 -r -t 30
  ------------------------------------------------------------
  Server listening on TCP port 5001
  TCP window size: 85.3 KByte (default)
  ------------------------------------------------------------
  ------------------------------------------------------------
  Client connecting to 192.168.10.11, TCP port 5001
  TCP window size: 136 KByte (default)
  ------------------------------------------------------------
  [ 5] local 192.168.10.21 port 39466 connected with 192.168.10.11 port 5001
  [ ID] Interval Transfer Bandwidth
  [ 5] 0.0-30.1 sec 125 MBytes 34.8 Mbits/sec
  [ 4] local 192.168.10.21 port 5001 connected with 192.168.10.11 port 60995
  [ 4] 0.0-30.2 sec 206 MBytes 57.1 Mbits/sec

  ----------

  Complete system:
  Dell Latitude E6400, RAM 4GB, CPU Intel E8400, Network controller: Intel Corporation Centrino Ultimate-N 6300

  ----------

  What is the full computer model number (ex. HP G32-301TX Notebook PC)?
  Dell Latitude E6400 Notebook, newest Bios A34

  If you update your BIOS to the newest version following the guide here, does this change anything?
  Already newest BIOS installed

  Regarding your wireless Access Point (AP):
  3a. What is the current AP manufacturer, full model, revision, and firmware version?
  AVM, Fritzbox 7490, v1, FRITZ!OS:06.51

  3b. If you update the AP to the latest firmware does it change anything?
  Already newest firmware installed.

  3c. What wireless connection type are you using (802.11ac, 802.11n 150/300, 802.11g, etc.)?
  802.11n with 450Mbit/s 3x3 Mimo, 5GHz

  3d. If you switch to a different wireless type (802.11g or 802.11n if you are using 802.11g) does this change anything?
  In 802.11n 2.4GHz throughput is also lower

  3e. What channel specifically are you using when this problem is reproducible?
  36

  3f. In order to understand the wireless environment your AP is working in, please provide the output of the following terminal command:
  sudo iw dev wlan0 scan | grep -i "ds parameter set"
  sudo iw dev wlp12s0 scan | grep -i "ds parameter set"
          DS Parameter set: channel 36
          DS Parameter set: channel 1
          DS Parameter set: channel 1
          DS Parameter set: channel 1
          DS Parameter set: channel 1
          DS Parameter set: channel 4
          DS Parameter set: channel 6
          DS Parameter set: channel 6
          DS Parameter set: channel 7
          DS Parameter set: channel 9
          DS Parameter set: channel 10
          DS Parameter set: channel 11
          DS Parameter set: channel 11
          DS Parameter set: channel 11
          DS Parameter set: channel 11
          DS Parameter set: channel 12
          DS Parameter set: channel 112

  3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
  WPA2-PSK

  3h. If you change and remove encryption entirely does this change anything?
  Not tested, because only WPA2 makes sense to get high troughput.

  3i. Do you have QoS (Quality of Service)/WMM (Wi-Fi Multimedia) enabled?
  WMM, Connection properties according to the Fritzbox interface: STBC, TxBF, LDPC, PMF

  3j. If you disable/enable QoS/WMM does it change anything?
  I dont know how.

  3k. What is the current beacon interval (usually default is 100)?
  I dont know how.

  3l. If you adjust this to 50 does it change anything?
  I dont know how.

  3m. Does your AP have a firewall enabled?
  yes

  3n. If you enable/disable the firewall does it change anything?
  no

  3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
  5GHz

  3p. If you change frequency does it change anything?
  no

  Does another wireless device tested with the AP have the same problem as the hardware you initially reported with?
  no

  What is the distance of the wireless device from the AP?
  2.5m

  What is the number and type of obstructions between your device and the AP?
  direct sight, no obstructions.

  6a. If you bring the device close to the AP and eliminate obstructions, does this change anything?
  no

  Does the issue occur with different APs?
  Not tested.

  Is it a regression (i.e. did the problem happen in a prior Ubuntu release)? If so, what release specifically did it last work with? If you do not know, could you please test for this in the earliest release of Ubuntu that is supported as per Ubuntu Releases?
  Yes it is a regression. (K)ubuntu 12.04.04 LTS worked well.
  Linux X-mobile 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  X@X-mobile:~$ iperf -c 192.168.10.11 -t 30 -r
  ------------------------------------------------------------
  Server listening on TCP port 5001
  TCP window size: 85.3 KByte (default)
  ------------------------------------------------------------
  ------------------------------------------------------------
  Client connecting to 192.168.10.11, TCP port 5001
  TCP window size: 23.5 KByte (default)
  ------------------------------------------------------------
  [ 5] local 192.168.10.21 port 59437 connected with 192.168.10.11 port 5001
  [ ID] Interval Transfer Bandwidth
  [ 5] 0.0-30.0 sec 604 MBytes 169 Mbits/sec
  [ 4] local 192.168.10.21 port 5001 connected with 192.168.10.11 port 32793
  [ 4] 0.0-30.2 sec 668 MBytes 185 Mbits/sec

  Could you please test upstream's compat-wireless backports via https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_from_upstream? Please mention in your report the specific version you tested.
  Will follow in next comment (after i restarted)

  If the above backport did work, does this problem occur in the newest mainline kernel following https://wiki.ubuntu.com/Kernel/MainlineBuilds? Please mention what specific version of the mainline kernel you tested with in your report.
  -

  If the mainline works, does either the development release or the Ubuntu provided stable compat-wireless backport work following https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_in_Ubuntu? Please mention in your report the specific version you tested.
  -

  Only for Intel wireless chipsets:

  14a. Please advise to which firmware version the device is using. Stating the linux-firmware version (ex. apt-cache policy linux-firmware), while necessary, is not the firmware version in use, but the package version of linux-firwmare. In order to find the version in use, one may check dmesg. For example, if the chipset was using the iwlwifi driver:
  sudo cat /var/log/syslog | grep "firmware version"
  [    5.720248] iwlwifi 0000:0c:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm

  ----------

  Following questions are answered in later comments.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-24-generic 4.4.0-24.43
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mellhen    1530 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sun Jun 19 19:32:08 2016
  HibernationDevice: RESUME=UUID=f43a948f-c937-45e4-b869-77b1bd2ae610
  InstallationDate: Installed on 2016-06-19 (0 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: Dell Inc. Latitude E6400
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-24-generic root=UUID=f93d1069-b1e0-423d-917f-df2e1878d54c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-24-generic N/A
   linux-backports-modules-4.4.0-24-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/04/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A34
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA34:bd06/04/2013:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

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References

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