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nicoulaj

Member

From: France

Registered: 2011-10-10

Posts: 34

Asus zenbook UX31 - slow wifi

Hi all,

On a Asus Zenbook UX301LA DE016P, I can't get the wifi to be as fast on Linux as it is on Windows:
- Windows: 150Mbits/s down - 50 Mbits/s up
- Arch: 30 MBits/s - 50 Mbits/s up

The wifi chip is a Intel 7260:

$ sudo lspci -vv -s 02:00.0
02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)
	Subsystem: Intel Corporation Dual Band Wireless-AC 7260
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 45
	Region 0: Memory at f7c00000 (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: 00000000fee0f00c  Data: 41e1
	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 L0s L1, Exit Latency L0s <4us, L1 <32us
			ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
		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 7c-7a-91-ff-ff-e1-db-3d
	Capabilities: [14c v1] Latency Tolerance Reporting
		Max snoop latency: 3145728ns
		Max no snoop latency: 3145728ns
	Capabilities: [154 v1] Vendor Specific Information: ID=cafe Rev=1 Len=014 <?>
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

Things look fine on wavemon:

$ wavemon -d
Configured device: wlp2s0 (IEEE 802.11abgn)
         Security: WPA, WPA2, TKIP, CCMP
        Key sizes: WEP-40, WEP-104

            essid: "JN"
          channel: 104
        frequency: 5.52 GHz
         tx-power: 22 dBm (158.49 mW)
             mode: Managed
     access point: XXXXXXXXXXXXXXXXXX
          bitrate: 300 Mbit/s
            retry: short limit 7
          rts thr: off
         frag thr: off
       encryption: n/a (requires CAP_NET_ADMIN permissions)
 power management: on

     link quality: 70/70
     signal level: -39 dBm (0.13 uW)
      noise level: 0 dBm (1.00 mW)
              SNR: -39 dB
         RX total: 261229 packets (349.86 MiB)
     invalid nwid: 0
      invalid key: 0
   invalid fragm.: 0
   missed beacons: 0
      misc errors: 630
         TX total: 128888 packets (47.65 MiB)
 exc. MAC retries: 0

The download speed is very stable, looks like software throttling or something. Also, it seems strange that upload is not affected...

Any clue ?

Last edited by nicoulaj (2015-01-13 21:00:46)

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AUR | github | IRC:nicoulaj

nicoulaj

Member

From: France

Registered: 2011-10-10

Posts: 34

Re: Asus zenbook UX31 - slow wifi

Update: disabling power management on the device improves bandwidth by 25% (40 MBits/s).

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AUR | github | IRC:nicoulaj