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IS7
Beginner
1,540 Views

Dual Band Wireless-AC 7265 reaches only 300mbps under Linux

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Hello,

uname -a

Linux NUK01 3.19.0-15-generic # 15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

sudo lspci -vmmk -s 02:00

Slot: 02:00.0

Class: Network controller

Vendor: Intel Corporation

Device: Wireless 7265

SVendor: Intel Corporation

SDevice: Dual Band Wireless-AC 7265

Rev: 59

Driver: iwlwifi

summerborn@NUK01:~$ sudo lspci -vvvkn -s 02:00

02:00.0 0280: 8086:095a (rev 59)

Subsystem: 8086:9010

Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+

Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR-

Latency: 0, Cache Line Size: 64 bytes

Interrupt: pin A routed to IRQ 52

Region 0: Memory at f7100000 (64-bit, non-prefetchable) [size=8K]

Capabilities: [c8] Power Management version 3

Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)

Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+

Address: 00000000fee00458 Data: 0000

Capabilities: [40] Express (v2) Endpoint, MSI 00

DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 unlimited

ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+

DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-

RlxdOrd+ ExtTag- PhantFunc- AuxPwr+ NoSnoop+ FLReset-

MaxPayload 128 bytes, MaxReadReq 128 bytes

DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-

LnkCap: Port # 0, Speed 2.5GT/s, Width x1, ASPM L1, Exit Latency L0s <4us, L1 <32us

ClockPM+ Surprise- LLActRep- BwNot-

LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+

ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-

LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

DevCap2: Completion Timeout: Range B, TimeoutDis+, LTR+, OBFF Via WAKE#

DevCtl2: Completion Timeout: 16ms to 55ms, TimeoutDis-, LTR+, OBFF Disabled

LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-

Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-

Compliance De-emphasis: -6dB

LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-

EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-

Capabilities: [100 v1] Advanced Error Reporting

UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-

UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-

UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-

CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-

CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+

AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-

Capabilities: [140 v1] Device Serial Number 34-13-e8-ff-ff-20-e8-9c

Capabilities: [14c v1] Latency Tolerance Reporting

Max snoop latency: 3145728ns

Max no snoop latency: 3145728ns

Capabilities: [154 v1] L1 PM Substates

L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+

PortCommonModeRestoreTime=30us PortTPowerOnTime=60us

Kernel driver in use: iwlwifi

iwconfig wlan0

wlan0 IEEE 802.11abgn ESSID:"XXXXXX"

Mode:Managed Frequency:5.18 GHz Access Point: 04:DA:D2:AA:B6:4F

Bit Rate=300 Mb/s Tx-Power=18 dBm

Retry short limit:7 RTS thr:off Fragment thr:off

Power Management:on

Link Quality=70/70 Signal level=-36 dBm

Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0

Tx excessive retries:0 Invalid misc:377 Missed beacon:0

May 1 13:59:53 NUK01 kernel: [ 7.551523] Intel(R) Wireless WiFi driver for Linux, in-tree: May 1 13:59:53 NUK01 kernel: [ 7.552431] iwlwifi 0000:02:00.0: Unsupported splx structure May 1 13:59:53 NUK01 kernel: [ 7.558885] iwlwifi 0000:02:00.0: loaded firmware version 25.15.12.0 op_mode iwlmvm May 1 13:59:53 NUK01 kernel: [ 7.594350] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210 May 1 13:59:53 NUK01 kernel: [ 7.595882] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled May 1 13:59:53 NUK01 kernel: [ 7.596194] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled

May 1 13:59:53 NUK01 NetworkManager[817]: rfkill1: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.3/0000:02:00.0/ieee80211/phy0/rfkill1) (driver iwlwifi)

May 1 13:59:53 NUK01 NetworkManager[817]: Loaded device plugin: /usr/lib/x86_64-linux-gnu/NetworkManager/libnm-device-plugin-wifi.so

May 1 13:59:53 NUK01 NetworkManager[817]: WiFi enabled by radio killswitch; enabled by state file

May 1 13:59:53 NUK01 NetworkManager[817]: (wlan0): using nl80211 for WiFi device control

May 1 13:59:53 NUK01 NetworkManager[817]: (wlan0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 3)

May 1 13:59:53 NUK01 kernel: [ 11.797647] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled

May 1 13:59:53 NUK01 kernel: [ 11.797806] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled

May 1 14:00:03 NUK01 NetworkManager[817]: WiFi hardware radio set enabled

May 1 18:44:24 NUK01 kernel: [17071.586237] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled

May 1 18:44:24 NUK01 kernel: [17071.586442] iwlwifi 0000:02:00.0: L1 Disabled - LTR Enabled

The ap:

Cisco IOS Software, C3600 Software (AP3G2-K9W8-M), Version 15.3(3)JA3, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport http://www.cisco.com/techsupport

Copyright (c) 1986-2015 by Cisco Systems, Inc.

Compiled Thu 19-Feb-15 10:21 by prod_rel_team

ROM: Bootstrap program is C3600 boot loader

BOOTLDR: C3600 Boot Loader (AP3G2-BOOT-M) LoaderVersion 12.4(23)JY, RELEASE SOFTWARE (fc1)

hor-ror-ap-1 uptime is 12 hours, 12 minutes

System returned to ROM by power-on

System image file is "flash:/ap3g2-k9w8-mx.153-3.JA3/ap3g2-k9w8-xx.153-3.JA3"

Last reload reason:

...
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1 Solution
jbenavides
Honored Contributor II
224 Views

Hello Summerborn,

The difference you noticed is due to the specifications and the type of networking standard supported by the access point and the wireless adapters. This is not a problem, nor a limitation of the Operating System.

The Intel® Dual Band Wireless-AC 7265 has a maximum speed of up to 867 Mbps, enabled by 2x2 802.11ac implementations.

The 2x2 specification of this adapter means it uses http://www.intel.com/support/wireless/sb/cs-025345.htm MIMO technology and that it has 2 antennas, hence, it supports 2 data streams.

The actual speed will depend on the WiFi standard used in the network, the max speed requires wireless AC, however, the adapter can also work with IEEE 802.11abgn, 802.11ac, 802.11d, 802.11e, 802.11i, 802.11h, 802.11w.

In your case, the adapter seems to be operating in 802.11n, the throughput of each data stream in Wireless N is 150 Mbps. Since the AC 7265 has 2 data streams, it will have a maximum throughput of 300 Mbps when operating in 802.11n.

The adapter in your Macbook is probably 3x3, supporting 3 data streams, for a maximum of 450 Mbps in 802.11n

For additional information about this, you can check the following documents:

http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/dual-band-wireless-ac-726... Intel® Dual Band Wireless-AC 7265 Product Brief

http://www.intel.com/content/dam/www/public/us/en/documents/pdf/next-gen-80211ac-wifi-for-dummies.pd... Next-Gen 802.11ac Wi-Fi for Dummies, pages 9-10.

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2 Replies
jbenavides
Honored Contributor II
225 Views

Hello Summerborn,

The difference you noticed is due to the specifications and the type of networking standard supported by the access point and the wireless adapters. This is not a problem, nor a limitation of the Operating System.

The Intel® Dual Band Wireless-AC 7265 has a maximum speed of up to 867 Mbps, enabled by 2x2 802.11ac implementations.

The 2x2 specification of this adapter means it uses http://www.intel.com/support/wireless/sb/cs-025345.htm MIMO technology and that it has 2 antennas, hence, it supports 2 data streams.

The actual speed will depend on the WiFi standard used in the network, the max speed requires wireless AC, however, the adapter can also work with IEEE 802.11abgn, 802.11ac, 802.11d, 802.11e, 802.11i, 802.11h, 802.11w.

In your case, the adapter seems to be operating in 802.11n, the throughput of each data stream in Wireless N is 150 Mbps. Since the AC 7265 has 2 data streams, it will have a maximum throughput of 300 Mbps when operating in 802.11n.

The adapter in your Macbook is probably 3x3, supporting 3 data streams, for a maximum of 450 Mbps in 802.11n

For additional information about this, you can check the following documents:

http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/dual-band-wireless-ac-726... Intel® Dual Band Wireless-AC 7265 Product Brief

http://www.intel.com/content/dam/www/public/us/en/documents/pdf/next-gen-80211ac-wifi-for-dummies.pd... Next-Gen 802.11ac Wi-Fi for Dummies, pages 9-10.

View solution in original post

IS7
Beginner
224 Views

Thank you, it is clear now!

Reply