Hi,
In 20/40 mode if there is a transmission on extended channel while
primary channel is idle. Using only the data given in the struct of
spectral scan. How can we determine it.
Regards,
Kamran
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Hi,
according to wireshark (radiotap.mcs.bw field) some MPDUs in an
A-MPDU are recieved at 40Mhz while others are reiceved at 20Mhz. AP is
working in 20/40 mixed mode. I dont think bandwidth change within an
A-MPDU is possible. Is there a bug in wireshark or in my
inderstanding?
kamran
_
Hi
how can i stop an AP to respond to a clients probe request with a
probe response should i do it at the mac80211?
Regrads,
Kamran
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Hi,
I want to ask how channel width is changed in the driver ath9k.
Function ath_set_channel in channel.c is called on the change in
channel width in openwrt. It "says first cleanup all pending DMAs".
Does this means all packets in the HW buffer will be send before
change?
In the specification of
But for this channel conditions should be changing at the scale of 100
micro secs consistently.
On Sat, Oct 25, 2014 at 12:13 AM, Adrian Chadd wrote:
> It's not completely unsurprising - the initial channel estimate and
> such is done at the beginning of each packet and stays constant. So if
> th
How did u determine that? only by looking at the Bitmaps in BlockAcks?
On Fri, Oct 24, 2014 at 9:04 PM, Ali Abedi wrote:
> Hello,
>
> We study the effects of 802.11n frame aggregation on throughput. We
> noticed a
> strange pattern in the MPDU loss within an aggregated frame. It seems
> that the
One more thing did u tried putting your sniffing (monitoring) PC close to
the iwlwifi based device?
On Fri, Oct 24, 2014 at 2:51 PM, Kamran Nishat
wrote:
> we saw this but according to some list of iwlwifi driver. AMPDUs are off.
> Are u sure, u got BlockAcks from iwlwifi
>
> On
we saw this but according to some list of iwlwifi driver. AMPDUs are off.
Are u sure, u got BlockAcks from iwlwifi
On Fri, Oct 24, 2014 at 1:58 PM, Tsaixiong wrote:
> Astrit Zhushi cs.ucl.ac.uk> writes:
>
> >
> > Hi,
> > I need to capture aggregate MPDUs between an AP and a client (both
> runni
It is a part of 802.11n because of compatibility with 802.11e. But because
802.11n gives a much more advanced AMPDU based thing I think no one
implemented it. It not a mandatory part of WMM I suppose.
On Thu, Oct 23, 2014 at 7:22 PM, Kamran Nishat
wrote:
> I was talking about the same one.
I think you should look in earlier drivers from Atheors. Because this
delayed BA for separate packets was introduced before 802.11n in
802.11e perhaps.
On Thu, Oct 23, 2014 at 8:18 AM, Adrian Chadd wrote:
> I don't think mac80211 supports delayed-BA. :(
>
>
> -adrian
>
>
> On 22 October 2014 08:3
to switch to 20MHz do u have any idea what will be the delay and what rate
would be picked.
On Wed, Sep 24, 2014 at 9:52 PM, Adrian Chadd
wrote:
> On 22 September 2014 14:14, Kamran Nishat wrote:
> > Hi,
> > FIRST, Will there be any difference in duration of PHY header for 20MHz
Hi,
FIRST, Will there be any difference in duration of PHY header for 20MHz and
40Mhz.
Do u think 40Mhz header will take lesser time?
Second, if my AP is connected to a client on 40MHz (Channel Bonding).
During Carrier Sense (CS) it sense ext channel of 20MHz is busy will it
automatically switch t
Hi,
Is it possible to change channel width at the packet level in ath9k. For
example if AP connected with a client on 40Mhz channel wants to send next
packet on 20Mhz primary channel.
Kamran
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hi
yes this is the expected behaviour. one can only get spectral scans for
things cannot be decoded as valid packets by HW. One way to receive scans
for packets is to scan on 40MHz channel while sending traffic on a 20Mhz
sub channel.
kamran
On Thu, Jul 24, 2014 at 12:29 AM, mahaveer gupta
wro
Hi,
I am trying to access transport layer header in MAC (ath9k or mac80211). Is
there any standard way to do that like mac80211/wme.c access TOS fields of
IP header.
regards,
Kamran
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abotu the whole air being idle.
>
>
> -a
>
>
> On 19 July 2014 14:14, Kamran Nishat wrote:
> > Hi,
> > Is there a way or any debugs entry to find for how much time HW has been
> in
> > idle state. Or can I estimate Tx a
Hi,
Is there a way or any debugs entry to find for how much time HW has been in
idle state. Or can I estimate Tx and Rx time for HW?
Regards,
Kamran
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Hi,
Did anyone tried spectral scan in background mode for a longer duration of
5-10secs?
We tried with but scans stopped after ~200-500 scans and we need to trigger
it again. Any idea why?
Regards,
Kamran
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in, and update it to work with the latest kernel! :)
>
>
> [1] https://wiki.freebsd.org/dev/ath_hal%284%29/SpectralScan
>
>
> On Mon, Apr 7, 2014 at 8:35 PM, Kamran Nishat wrote:
>
>> Hi Mathy
>> Can u please share the details of your 60K/s samples with us. How were u
at 1:47 AM, Mathy wrote:
> Hi Kamran,
>
> Some time ago I was able to get 60k samples per second using a modified
> ath9k_htc driver and firmware. I don't know whether better is possible.
> What are you planning to do with it?
>
> Cheers,
> Mathy
>
>
> On Sat,
Hi,
What will be the finest granularity of time to get spectral scan. I assume
it should be 4usec as i can set spectral_fft_period =1 then
(fft_period+1)*4uS= 4uS. But then what would be the use of
spectral_period variable?
Kamran
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Thanks for quick reply. Do u know what does "bitmap_weigh" suppose to mean.
On Fri, Mar 21, 2014 at 11:55 PM, Gui Iribarren wrote:
> On 03/21/2014 03:22 PM, Kamran Nishat wrote:
>> i am getting scans "chanscan" mode. All the values are easy to
>> understan
i am getting scans "chanscan" mode. All the values are easy to
understand except "bitmap_weigh". But once i change mode to
background. it stops working. Nothing got in the spectral scan. I
tried printing values directly from ath_process_fft in recv.c, but
still no success.
Do we need to any other
as Adrian said we got information received in a BlockACK
(ath_tx_complete_aggr in xmit.c)
you get a bitmap, SSN and retires done for AMPDU.
On Mon, Feb 10, 2014 at 1:57 PM, Olivier Marce <
olivier.ma...@alcatel-lucent.com> wrote:
> Thanks for the quick and precise answer.
>
> Then, I wonder is
t; Does setting retry to 1 solves this problem? My understanding is that if
> retry is 1 then we move the BA window
> anyway (regardless of frame error) by 32 each time. Is this right?
>
> Thanks,
> Ali
>
>
> On 22/01/2014 11:02, Kamran Nishat wrote:
>
> Check if they are
ames than 20
> ---
> Max A-mpdu size = 32 * 1550 B
> 80
> 320
> 20
> 3232
> 30
> 320
> 10
> 32 0
> 4 4
> 10
> 3232
>
> It happens even more frequently.
>
> Is there a solution to this pro
ll aggregate frames carry exactly 20 frames (constant rate)?
>
> Thank you,
> Ali
>
>
> On 21/01/2014 15:59, Kamran Nishat wrote:
>
>
>
>
>
> do it at a fix rate (1st check if duration of packet is less tahn 4ms for
> ur MCS) and with nearly zero noise los
n set min=max and lock the AMPDU length.
>
> Thank you,
> Ali
>
> On 21/01/2014 15:07, Kamran Nishat wrote:
>
> As far as i know AMPDU length is determined by 3 constraints. Firs maximum
> AMPDU length. second blockAck window (if there were losses then this will
> play a
As far as i know AMPDU length is determined by 3 constraints. Firs maximum
AMPDU length. second blockAck window (if there were losses then this will
play a role). Third is Max air time of the AMPDU which is 4ms for some
domain constraints. this comes into play MCS is low and packet duration
gets m
Hi,
I guess there is some RF tunning/caliberation code in calib.c Can it be
used to adjust the offset of 500KHz in different NIC like 5416 and 9160
when used in 5/10MHz width channel?
Best
Kamran
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37Mbps whao which Rate Control did u use I fixed MCS 4 and I got only 4Mbps
at max.
Kamran
On Fri, Nov 29, 2013 at 1:25 PM, Sergey Ryazanov wrote:
> 2013/11/29 Kamran Nishat :
> > Hi,
> Hi
>
> > Does anyone ever use used 5/10Mhz channel in infrastructure (AP/client)
>
Hi,
Does anyone ever use used 5/10Mhz channel in infrastructure (AP/client)
mode. If yes then can you tell me ur Atheros cards versions and rate
control you used.
I have done this with openwrt with AR9160. But throughput were very bad
even for very short range. But I am unable to do it with mainst
-- Forwarded message --
From: Kamran Nishat
Date: Sat, Nov 23, 2013 at 12:00 PM
Subject: Re: [ath9k-devel] ath9k: set 5/10 MHz supported channels
To: Simon Wunderlich
Simon
Can we merge openwrt source and iwreless-next tree? what will happen if we
do this?
Best
Kamran
On Fri
Thanks Adrian for your reply. But there are certain things I am still not
to understand. First I am have set my AR9160 based AP to channel 11 which
is in 2.4G range not in 5GHz range.
Second my AR5416 card can see it but but was not able to connect. Why? Are
they with different 500KHz offset? Why i
I have an AP with AR9160 tunning openWRT. When I set chennel to 10MHz from
debugfs entry. I can still connect it with other boards running OpenWrt.
But from computers running latest linux kernel it was visible in scan when
I was using AR5416 but I was not able to connect to my AP.
Then I changed N
Can I change the center of my 5/10MMHz channel so I can accommodated more
than one channels in official 802.11 20Mhz channel? If not then is it for
HW reason or b/c of driver?
On Mon, Nov 18, 2013 at 4:07 PM, Simon Wunderlich
wrote:
> Hey Tomas,
> > > I still had a patch for iw on my disk which
Hi,
>
> 2013/11/8 Kamran Nishat :
> > Hi,
> > I want to set 5 and 10 MHz channels. My AP has Atheros AR9160 and my
> nodes
> > have AR5416. Are they supported for my cards. Can I go to higher MCS like
> > 12-13 on a 5MHz channel?
> >
> Current mainstre
Dear Alex,
Can you send me updates in driver to make it support 5/10Mhz channel both
at client and AP ath9k. Also how can i set my channel to 5/10Mhz in
settings.
Kamran
On Mon, Nov 11, 2013 at 2:16 PM, Alex Hacker wrote:
> Thank you Adrian. Yes I know, but I can not get it working with AR9390
Hi,
I want to set 5 and 10 MHz channels. My AP has *Atheros* AR9160 and my
nodes have AR5416. Are they supported for my cards. Can I go to higher MCS
like 12-13 on a 5MHz channel?
Regards,
Kamran
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hello
Can we force ath9k to send every packet as an AMPDU. Currently if there is
only one packet in the queue then ath9k tell the hardware to just send it
as MPDU.
Is there a way to ask driver to wait for more packets and send them as
AMPDU? Simple wait is not working in ath_tx_start(), ath_tx_sen
hello can we force ath9k to send every packet as an AMPDU. Currently if
there is only one packet in the queue then ath9k tell the hardware to just
send it as MPDU.
Is there a way to ask driver to wait for more packets and send them as
AMPDU? Simple wait is not working in ath_tx_start(), ath_tx_sen
Hi,
there is a tread of CSI support on the list with one reply from Adrian
saying Atheros HW does support it but no further reply. Can anyone please
enlighten us.
Kamran
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Hi Do u know ar5416 does support Message in Message (MIM) in case of
interfering signals Carrier Sense. MIM means
means if a recv is looked on one packet and another packet is started
coming with higher strength.
many Atheros cards leave the weaker signal and start recv the new stronger
signal.
R
Hi Do u know ar5416 does support Message in Message (MIM) in case of
interfering signals Carrier Sense. MIM means
means if a recv is looked on one packet and another packet is started
coming with higher strength.
many Atheros cards leave the weaker signal and start recv the new stronger
signal.
with ath9k_hw_computetxtime(). So if
I subtract this duration from ts_tsramp it will give me TX starting time.
Please comment on this am I right or not.
Regards,
Kamran Nishat
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Hi Adrian,
How can I get FCS of MPDUs sent with them in xmit. Is it possible to get
the FCS of BA also.
Regards,
Kamran
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Do u know how can i current Tx rate at the runtime in the driver.
Kamran
On Wed, Sep 5, 2012 at 7:07 PM, Adrian Chadd wrote:
> On 5 September 2012 01:22, Kamran Nishat wrote:
> > I want to get the TX rate. In the xmit.c ath_buf_set_rate it sets four
> > rates. Are they Tx rate
I want to get the TX rate. In the xmit.c ath_buf_set_rate it sets four
rates. Are they Tx rates for different retries? if not then which function
is suitable to get Tx rate?
regards,
Kamran
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Hello,
We want to change Backoff window dynamically using some scheme. Where
should we look for the code which is called before Tx of each AMPDU to set
parameters like cwmin and cwmax.
Regards,
Kamran
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Hello,
Do you know the last function in the driver which is called before Tx
every MPDU or at least before Tx of a AMPDU. We want to timestamp the
Tx time in the log.
Regards,
kamran
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Hi,
How can i get the clock time in ath9k with minimum overhead.
Which function is the last called during TX for an MPDU? similarly
which one is the first in RX for a MPDU?
Regards,
Kamran
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different
functions of mac.c. Can you please help? It would be really nice if
you could some what guide us in this process.
Regards,
Kamran Nishat
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To disable rate control use.
config ATH9K_RATE_CONTROL
bool "Atheros ath9k rate control"
depends on ATH9K
default y
---help---
Say Y, if you want to use the ath9k specific rate control
module instead of minstrel_ht.
But if you want to fix rate in ath9k
Hi,
Is there any patch or other way to use iwpriv for any interface using
ath9k driver? currently I am getting "no private ioctls" error.
Regards,
Kamran
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Hi,
According to my understanding if a MPDU got lost in a A-MPDU it must
be retransmitted in the next A-MPDU. We collected a lots of dumps
using ath9k driver at sender, receiver and sniffer. Dumps suggests
that lost packets are not always retransmitted in the immediate next
AMPDU. Sometimes it is d
Hi ,
Do u know can we limit # of MPDUs is in a A-MPDU. We want to do some
controled experiments. Making A-MPDUs of
constant size will help in great deal.
Kamran
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Hello,
For some experimental purposes we want to turn Carrier sense completely
off. So node do not compete for the access of channel before sending. It
has been done 3 years back. bu t i was not able to find the patch.
Kamran
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Thanks a lot, it is working now.
On Tue, Jun 5, 2012 at 5:54 PM, Kamran Nishat wrote:
> root@wireless2:/sys/kernel/debug/ieee80211/phy0/ath9k# cat ../rc/name
> minstrel_ht
>
> root@wireless2:/sys/kernel/debug/ieee80211/phy0/ath9k# echo 15 >
> fix_mcs_rate
>
> SSID: w
root@wireless2:/sys/kernel/debug/ieee80211/phy0/ath9k# cat ../rc/name
minstrel_ht
root@wireless2:/sys/kernel/debug/ieee80211/phy0/ath9k# echo 15 >
fix_mcs_rate
SSID: wireless
freq: 2412
RX: 2068030 bytes (14072 packets)
TX: 2439 bytes (83 packets)
signal: -58 dBm
tx bitrat
This is the output from menuconfig for ATH9K search option. There is no
option like ATH_DEBUG or ATH_DEBUGFS.
Symbol: PACKAGE_kmod-ath9k
[=y]
│
│ Prompt: kmod-ath9k Atheros 802.11n PCI wireless
cards support │
│ Defined at tmp/.config-package.in:7113
I have applied the patch to disable ath9k Rate Control in my OpenWRT
compilation. But now I am unable to set 11n specific (MCS 10-15) rates
using iw dev.
Kamran
On Mon, May 28, 2012 at 8:40 PM, Mohammed Shafi wrote:
> On Mon, May 28, 2012 at 7:53 PM, Sujith Manoharan
> wrote:
> > Mohammed Shafi
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