[ath9k-devel] disable dynamic power save in AR9280

[ath9k-devel] disable dynamic power save in AR9280

[BC]

I am working with AR9280 wireless cards and I cannot seem to disable the dynamic power save poll. I have tried "iw wlan1 power_save off" and I also tried "iwconfig wlan1 power off", and when I run iwconfig it shows "Power Management: off" but still during my experiments I found that every ~120 seconds for a duration of about ~15 seconds the stations enter power save mode which severely effects the throughput and jitter.


Is there a way to disable this dynamic power save? I cannot move on with my experiments until I solve this issue, any help is greatly appreciated. Note that I am familiar with hacking the driver so maybe someone can point me in the right direction on where to change the code (unless there is an easier solution?).


I am currently running compat-wireless 2.6.37-4-sn and I also had this problem with compat-wireless 2.6.35-1.


Here is a little more information on how I am set-up: I am using Iperf to generate UDP traffic between two stations. I send for a duration of 300 sec and I can see in my plots of throughput and jitter that they are very smooth except every ~120 sec for  a duration of about ~15 seconds the jitter and throughput graphs go "crazy" (the jitter is increased and more varied and throughput becomes random). I looked at my wireshark packet sniffer output and noticed power save polls and Null packets being sent during these times.


Here is my system info:

SparkLAN WPEA-111N miniPCIx a,b,g,n AR9280


~/Desktop$ uname -a

Linux mike-netbook 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC 2010 i686 GNU/Linux



~/Desktop$  sudo lspci -vvv 
05:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
    Subsystem: Lite-On Communications Inc Device 6512
    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: 32 bytes
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [40] Power Management version 2
        Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
        Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
        Address: 00000000  Data: 0000
    Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
        DevCap:    MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
            ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
        DevCtl:    Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
            RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
            MaxPayload 128 bytes, MaxReadReq 512 bytes
        DevSta:    CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
        LnkCap:    Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency L0 <512ns, L1 <64us
            ClockPM- Suprise- LLActRep- BwNot-
        LnkCtl:    ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain- CommClk+
            ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta:    Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
    Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
        Vector table: BAR=0 offset=00000000
        PBA: BAR=0 offset=00000000
    Kernel driver in use: ath9k
    Kernel modules: ath9k


~/Desktop$ sudo lshw
    *-network
                description: Wireless interface
                product: AR928X Wireless Network Adapter (PCI-Express)
                vendor: Atheros Communications Inc.
                physical id: 0
                bus info: pci at 0000:05:00.0
                logical name: wlan1
                version: 01
                serial: 00:0e:8e:28:01:ed
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless logical
                configuration: broadcast=yes driver=ath9k driverversion=2.6.32-27-generic firmware=N/A ip=149.161.112.136 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
                resources: irq:16 memory:f0100000-f010ffff


Brandon M. Combs
Brmcombs@iusb.edu
cs.iusb.edu/~bcombs
(574)202-0972

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[ath9k-devel] disable dynamic power save in AR9280

[Mohammed Shafi]

On Sat, Jan 22, 2011 at 1:47 AM, BC <combsiu@aol.com> wrote:
> I am working with AR9280 wireless cards and I cannot seem to disable the
> dynamic power save poll. I have tried "iw wlan1 power_save off" and I also
> tried "iwconfig wlan1 power off", and when I run iwconfig it shows "Power
> Management: off" but still during my experiments I found that every ~120
> seconds for a duration of about ~15 seconds the stations enter power save
> mode which?severely?effects the throughput and jitter.
> Is there a way to disable this dynamic power save? I cannot move on with my
> experiments until I solve this issue, any help is greatly appreciated. Note
> that I am familiar with hacking the driver so maybe someone can point me in
> the right direction on where to change the code (unless there is an easier
> solution?).

Hi quick guess please tell if it works or not when you test it.Please
comment out this flag
  IEEE80211_HW_PS_NULLFUNC_STACK
and in addition you can disable this flag too IEEE80211_HW_SUPPORTS_PS


In init.c
void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
{
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);

        hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
                IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
                IEEE80211_HW_SIGNAL_DBM |
                IEEE80211_HW_SUPPORTS_PS |
//                IEEE80211_HW_PS_NULLFUNC_STACK | Comment this out ?
                IEEE80211_HW_SPECTRUM_MGMT |
                IEEE80211_HW_REPORTS_TX_ACK_STATUS;




> I am currently running compat-wireless 2.6.37-4-sn and I also had this
> problem with compat-wireless 2.6.35-1.
> Here is a little more information on how I am set-up: I am using Iperf to
> generate UDP traffic between two stations. I send for a duration of 300 sec
> and I can see in my plots of throughput and jitter that they are very smooth
> except every ~120 sec for??a duration of about ~15 seconds the jitter and
> throughput graphs go "crazy" (the jitter is increased and more varied and
> throughput becomes random). I looked at my wireshark packet sniffer?output
> and noticed power save polls and Null packets being sent during these times.
> Here is my system info:
> SparkLAN WPEA-111N miniPCIx a,b,g,n AR9280
> ~/Desktop$ uname -a
> Linux mike-netbook 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC
> 2010 i686 GNU/Linux
>
> ~/Desktop$ ?sudo lspci -vvv
> 05:00.0 Network controller: Atheros Communications Inc. AR928X Wireless
> Network Adapter (PCI-Express) (rev 01)
> ?? ?Subsystem: Lite-On Communications Inc Device 6512
> ?? ?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: 32 bytes
> ?? ?Interrupt: pin A routed to IRQ 16
> ?? ?Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=64K]
> ?? ?Capabilities: [40] Power Management version 2
> ?? ??? ?Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA
> PME(D0+,D1+,D2-,D3hot+,D3cold-)
> ?? ??? ?Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> ?? ?Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0
> Enable-
> ?? ??? ?Address: 00000000? Data: 0000
> ?? ?Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
> ?? ??? ?DevCap:?? ?MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1
> <64us
> ?? ??? ??? ?ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
> ?? ??? ?DevCtl:?? ?Report errors: Correctable- Non-Fatal- Fatal-
> Unsupported-
> ?? ??? ??? ?RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> ?? ??? ??? ?MaxPayload 128 bytes, MaxReadReq 512 bytes
> ?? ??? ?DevSta:?? ?CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr-
> TransPend-
> ?? ??? ?LnkCap:?? ?Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency
> L0 <512ns, L1 <64us
> ?? ??? ??? ?ClockPM- Suprise- LLActRep- BwNot-
> ?? ??? ?LnkCtl:?? ?ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain-
> CommClk+
> ?? ??? ??? ?ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> ?? ??? ?LnkSta:?? ?Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive-
> BWMgmt- ABWMgmt-
> ?? ?Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
> ?? ??? ?Vector table: BAR=0 offset=00000000
> ?? ??? ?PBA: BAR=0 offset=00000000
> ?? ?Kernel driver in use: ath9k
> ?? ?Kernel modules: ath9k
> ~/Desktop$ sudo lshw
> ?? ?*-network
> ??????????????? description: Wireless interface
> ??????????????? product: AR928X Wireless Network Adapter (PCI-Express)
> ??????????????? vendor: Atheros Communications Inc.
> ??????????????? physical id: 0
> ??????????????? bus info: pci at 0000:05:00.0
> ??????????????? logical name: wlan1
> ??????????????? version: 01
> ??????????????? serial: 00:0e:8e:28:01:ed
> ??????????????? width: 64 bits
> ??????????????? clock: 33MHz
> ??????????????? capabilities: pm msi pciexpress msix bus_master cap_list
> ethernet physical wireless logical
> ??????????????? configuration: broadcast=yes driver=ath9k
> driverversion=2.6.32-27-generic firmware=N/A ip=149.161.112.136 latency=0
> link=yes multicast=yes wireless=IEEE 802.11abgn
> ??????????????? resources: irq:16 memory:f0100000-f010ffff
> Brandon M. Combs
> Brmcombs at iusb.edu
> cs.iusb.edu/~bcombs
> (574)202-0972
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>
>

[ath9k-devel] disable dynamic power save in AR9280

[BC]

Thanks for your replies Mohammed and Vivek.
I found out that it was in fact gnome NetworkManager that was giving me the power save issue. (See Vivek's comment below.) 
I installed wicd and uninstalled gnome Network Manager and the issue stopped occurring.
Note: I had to run 'iwconfig wlan1 power off' before I could connect to the AP otherwise before that I kept getting 'could not obtain IP address' errors and I could not associate. But all is now working great. Thanks again for your replies.


Aside: how do I automatically add the ">" to show what I am replying to for this mailing list?
Brandon Combs  
>BC <combsiu@aol.com> wrote:
> I am working with AR9280 wireless cards and I cannot seem to disable
> the dynamic power save poll. I have tried "iw wlan1 power_save off"
> and I also tried "iwconfig wlan1 power off", and when I run iwconfig
> it shows "Power Management: off" but still during my experiments I
> found that every ~120 seconds for a duration of about ~15 seconds the
> stations enter power save mode which severely effects the throughput
> and jitter.

Power save is definitely disabled using the above commands. It looks
like you are using Network Manager and a scan is triggered
periodically for which mac80211 intimates a "fake sleep" to the AP
before moving to other channels for scanning.

To fix You need to prevent scanning. You can connect using  iwconfig or iw or
wpa_supplicant which just associate to the AP and these do not
initiate scan automatically.


Vivek.



-----Original Message-----
From: Mohammed Shafi <shafi.ath9k@gmail.com>
To: BC <combsiu@aol.com>
Cc: ath9k-devel <ath9k-devel@lists.ath9k.org>
Sent: Sat, Jan 22, 2011 1:33 am
Subject: Re: [ath9k-devel] disable dynamic power save in AR9280


On Sat, Jan 22, 2011 at 1:47 AM, BC <combsiu@aol.com> wrote:
> I am working with AR9280 wireless cards and I cannot seem to disable the
> dynamic power save poll. I have tried "iw wlan1 power_save off" and I also
> tried "iwconfig wlan1 power off", and when I run iwconfig it shows "Power
> Management: off" but still during my experiments I found that every ~120
> seconds for a duration of about ~15 seconds the stations enter power save
> mode which severely effects the throughput and jitter.
> Is there a way to disable this dynamic power save? I cannot move on with my
> experiments until I solve this issue, any help is greatly appreciated. Note
> that I am familiar with hacking the driver so maybe someone can point me in
> the right direction on where to change the code (unless there is an easier
> solution?).

Hi quick guess please tell if it works or not when you test it.Please
comment out this flag
  IEEE80211_HW_PS_NULLFUNC_STACK
and in addition you can disable this flag too IEEE80211_HW_SUPPORTS_PS


In init.c
void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
{
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);

        hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
                IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
                IEEE80211_HW_SIGNAL_DBM |
                IEEE80211_HW_SUPPORTS_PS |
//                IEEE80211_HW_PS_NULLFUNC_STACK | Comment this out ?
                IEEE80211_HW_SPECTRUM_MGMT |
                IEEE80211_HW_REPORTS_TX_ACK_STATUS;




> I am currently running compat-wireless 2.6.37-4-sn and I also had this
> problem with compat-wireless 2.6.35-1.
> Here is a little more information on how I am set-up: I am using Iperf to
> generate UDP traffic between two stations. I send for a duration of 300 sec
> and I can see in my plots of throughput and jitter that they are very smooth
> except every ~120 sec for  a duration of about ~15 seconds the jitter and
> throughput graphs go "crazy" (the jitter is increased and more varied and
> throughput becomes random). I looked at my wireshark packet sniffer output
> and noticed power save polls and Null packets being sent during these times.
> Here is my system info:
> SparkLAN WPEA-111N miniPCIx a,b,g,n AR9280
> ~/Desktop$ uname -a
> Linux mike-netbook 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC
> 2010 i686 GNU/Linux
>
> ~/Desktop$  sudo lspci -vvv
> 05:00.0 Network controller: Atheros Communications Inc. AR928X Wireless
> Network Adapter (PCI-Express) (rev 01)
>     Subsystem: Lite-On Communications Inc Device 6512
>     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: 32 bytes
>     Interrupt: pin A routed to IRQ 16
>     Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=64K]
>     Capabilities: [40] Power Management version 2
>         Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA
> PME(D0+,D1+,D2-,D3hot+,D3cold-)
>         Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>     Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0
> Enable-
>         Address: 00000000  Data: 0000
>     Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
>         DevCap:    MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1
> <64us
>             ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
>         DevCtl:    Report errors: Correctable- Non-Fatal- Fatal-
> Unsupported-
>             RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
>             MaxPayload 128 bytes, MaxReadReq 512 bytes
>         DevSta:    CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr-
> TransPend-
>         LnkCap:    Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency
> L0 <512ns, L1 <64us
>             ClockPM- Suprise- LLActRep- BwNot-
>         LnkCtl:    ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain-
> CommClk+
>             ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>         LnkSta:    Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive-
> BWMgmt- ABWMgmt-
>     Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
>         Vector table: BAR=0 offset=00000000
>         PBA: BAR=0 offset=00000000
>     Kernel driver in use: ath9k
>     Kernel modules: ath9k
> ~/Desktop$ sudo lshw
>     *-network
>                 description: Wireless interface
>                 product: AR928X Wireless Network Adapter (PCI-Express)
>                 vendor: Atheros Communications Inc.
>                 physical id: 0
>                 bus info: pci at 0000:05:00.0
>                 logical name: wlan1
>                 version: 01
>                 serial: 00:0e:8e:28:01:ed
>                 width: 64 bits
>                 clock: 33MHz
>                 capabilities: pm msi pciexpress msix bus_master cap_list
> ethernet physical wireless logical
>                 configuration: broadcast=yes driver=ath9k
> driverversion=2.6.32-27-generic firmware=N/A ip=149.161.112.136 latency=0
> link=yes multicast=yes wireless=IEEE 802.11abgn
>                 resources: irq:16 memory:f0100000-f010ffff
> Brandon M. Combs
> Brmcombs at iusb.edu
> cs.iusb.edu/~bcombs
> (574)202-0972
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>
>


 
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[ath9k-devel] disable dynamic power save in AR9280

[Mohammed Shafi]

On Sat, Jan 29, 2011 at 3:03 AM, BC <combsiu@aol.com> wrote:
> Thanks for your replies Mohammed and Vivek.
>
> I found out that it was in fact gnome NetworkManager that was giving me the
> power save issue. (See Vivek's comment below.)
>
Yes sure thanks.

> I installed wicd and uninstalled gnome Network Manager and the issue
> stopped?occurring.
>
> Note: I had to run 'iwconfig wlan1 power off' before I could connect to the
> AP otherwise before that I kept getting 'could not obtain IP address' errors
> and I could not associate. But all is now working great. Thanks again for
> your replies.
>
> Aside: how do I automatically add the ">" to show what I am replying to for
> this mailing list?

You have to choose the plain text format in Rich formatting
option(This for gmail)

>
> Brandon Combs
>
>>BC <combsiu@aol.com> wrote:
>> I am working with AR9280 wireless cards and I cannot seem to disable
>> the dynamic power save poll. I have tried "iw wlan1 power_save off"
>> and I also tried "iwconfig wlan1 power off", and when I run iwconfig
>> it shows "Power Management: off" but still during my experiments I
>> found that every ~120 seconds for a duration of about ~15 seconds the
>> stations enter power save mode which?severely?effects the throughput
>> and jitter.
>
> Power save is definitely disabled using the above commands. It looks
> like you are using Network Manager and a scan is triggered
> periodically for which mac80211 intimates a "fake sleep" to the AP
> before moving to other channels for scanning.
>
> To fix You need to prevent scanning. You can connect using ?iwconfig or iw
> or
> wpa_supplicant which just associate to the AP and these do not
> initiate scan automatically.
>
> Vivek.
>
> -----Original Message-----
> From: Mohammed Shafi <shafi.ath9k@gmail.com>
> To: BC <combsiu@aol.com>
> Cc: ath9k-devel <ath9k-devel@lists.ath9k.org>
> Sent: Sat, Jan 22, 2011 1:33 am
> Subject: Re: [ath9k-devel] disable dynamic power save in AR9280
>
> On Sat, Jan 22, 2011 at 1:47 AM, BC <combsiu@aol.com> wrote:
>> I am working with AR9280 wireless cards and I cannot seem to disable the
>> dynamic power save poll. I have tried "iw wlan1 power_save off" and I also
>> tried "iwconfig wlan1 power off", and when I run iwconfig it shows "Power
>> Management: off" but still during my experiments I found that every ~120
>> seconds for a duration of about ~15 seconds the stations enter power save
>> mode which?severely?effects the throughput and jitter.
>> Is there a way to disable this dynamic power save? I cannot move on with
>> my
>> experiments until I solve this issue, any help is greatly appreciated.
>> Note
>> that I am familiar with hacking the driver so maybe someone can point me
>> in
>> the right direction on where to change the code (unless there is an easier
>> solution?).
>
> Hi quick guess please tell if it works or not when you test it.Please
> comment out this flag
> ? IEEE80211_HW_PS_NULLFUNC_STACK
> and in addition you can disable this flag too IEEE80211_HW_SUPPORTS_PS
>
>
> In init.c
> void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
> {
> ? ? ? ? struct ath_common *common = ath9k_hw_common(sc->sc_ah);
>
> ? ? ? ? hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
> ? ? ? ? ? ? ? ? IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
> ? ? ? ? ? ? ? ? IEEE80211_HW_SIGNAL_DBM |
> ? ? ? ? ? ? ? ? IEEE80211_HW_SUPPORTS_PS |
> // ? ? ? ? ? ? ? ?IEEE80211_HW_PS_NULLFUNC_STACK | Comment this out ?
> ? ? ? ? ? ? ? ? IEEE80211_HW_SPECTRUM_MGMT |
> ? ? ? ? ? ? ? ? IEEE80211_HW_REPORTS_TX_ACK_STATUS;
>
>
>
>
>> I am currently running compat-wireless 2.6.37-4-sn and I also had this
>> problem with compat-wireless 2.6.35-1.
>> Here is a little more information on how I am set-up: I am using Iperf to
>> generate UDP traffic between two stations. I send for a duration of 300
>> sec
>> and I can see in my plots of throughput and jitter that they are very
>> smooth
>> except every ~120 sec for??a duration of about ~15 seconds the jitter and
>> throughput graphs go "crazy" (the jitter is increased and more varied and
>> throughput becomes random). I looked at my wireshark packet sniffer?output
>> and noticed power save polls and Null packets being sent during these
>> times.
>> Here is my system info:
>> SparkLAN WPEA-111N miniPCIx a,b,g,n AR9280
>> ~/Desktop$ uname -a
>> Linux mike-netbook 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC
>> 2010 i686 GNU/Linux
>>
>> ~/Desktop$ ?sudo lspci -vvv
>> 05:00.0 Network controller: Atheros Communications Inc. AR928X Wireless
>> Network Adapter (PCI-Express) (rev 01)
>> ?? ?Subsystem: Lite-On Communications Inc Device 6512
>> ?? ?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: 32 bytes
>> ?? ?Interrupt: pin A routed to IRQ 16
>> ?? ?Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=64K]
>> ?? ?Capabilities: [40] Power Management version 2
>> ?? ??? ?Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA
>> PME(D0+,D1+,D2-,D3hot+,D3cold-)
>> ?? ??? ?Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>> ?? ?Capabilities: [50] Message Signalled Interrupts: Mask- 64bit-
>> Queue=0/0
>> Enable-
>> ?? ??? ?Address: 00000000? Data: 0000
>> ?? ?Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00
>> ?? ??? ?DevCap:?? ?MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns,
>> L1
>> <64us
>> ?? ??? ??? ?ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
>> ?? ??? ?DevCtl:?? ?Report errors: Correctable- Non-Fatal- Fatal-
>> Unsupported-
>> ?? ??? ??? ?RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
>> ?? ??? ??? ?MaxPayload 128 bytes, MaxReadReq 512 bytes
>> ?? ??? ?DevSta:?? ?CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr-
>> TransPend-
>> ?? ??? ?LnkCap:?? ?Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency
>> L0 <512ns, L1 <64us
>> ?? ??? ??? ?ClockPM- Suprise- LLActRep- BwNot-
>> ?? ??? ?LnkCtl:?? ?ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain-
>> CommClk+
>> ?? ??? ??? ?ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>> ?? ??? ?LnkSta:?? ?Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
>> DLActive-
>> BWMgmt- ABWMgmt-
>> ?? ?Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
>> ?? ??? ?Vector table: BAR=0 offset=00000000
>> ?? ??? ?PBA: BAR=0 offset=00000000
>> ?? ?Kernel driver in use: ath9k
>> ?? ?Kernel modules: ath9k
>> ~/Desktop$ sudo lshw
>> ?? ?*-network
>> ??????????????? description: Wireless interface
>> ??????????????? product: AR928X Wireless Network Adapter (PCI-Express)
>> ??????????????? vendor: Atheros Communications Inc.
>> ??????????????? physical id: 0
>> ??????????????? bus info: pci at 0000:05:00.0
>> ??????????????? logical name: wlan1
>> ??????????????? version: 01
>> ??????????????? serial: 00:0e:8e:28:01:ed
>> ??????????????? width: 64 bits
>> ??????????????? clock: 33MHz
>> ??????????????? capabilities: pm msi pciexpress msix bus_master cap_list
>> ethernet physical wireless logical
>> ??????????????? configuration: broadcast=yes driver=ath9k
>> driverversion=2.6.32-27-generic firmware=N/A ip=149.161.112.136 latency=0
>> link=yes multicast=yes wireless=IEEE 802.11abgn
>> ??????????????? resources: irq:16 memory:f0100000-f010ffff
>> Brandon M. Combs
>> Brmcombs at iusb.edu
>> cs.iusb.edu/~bcombs
>> (574)202-0972
>> _______________________________________________
>> ath9k-devel mailing list
>> ath9k-devel at lists.ath9k.org
>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>>
>>
>
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>

[ath9k-devel] disable dynamic power save in AR9280

[Vivek Natarajan]

BC <combsiu@aol.com> wrote:
> I am working with AR9280 wireless cards and I cannot seem to disable
> the dynamic power save poll. I have tried "iw wlan1 power_save off"
> and I also tried "iwconfig wlan1 power off", and when I run iwconfig
> it shows "Power Management: off" but still during my experiments I
> found that every ~120 seconds for a duration of about ~15 seconds the
> stations enter power save mode which?severely?effects the throughput
> and jitter.

Power save is definitely disabled using the above commands. It looks
like you are using Network Manager and a scan is triggered
periodically for which mac80211 intimates a fake sleep to the AP
before moving to other channels for scanning.

Vivek.