[ath9k-devel] 802.11n throughput with ath9k

[ath9k-devel] 802.11n throughput with ath9k

[Tomasz Czaus]

Hello,

do you get such a performance in AP mode too? I have 300Mbps TP-Link 
TL-WN951N MIMO card an in AP mode I never get more than ~25Mb/s. Average 
result is ~7-15Mb/s. Honestly, I am a bit disappointed because of my 
previous card (TP-LINK with Atheros AR2413 802.11bg NIC (rev 01)) 
provided the same performance or even better because 22-25 Mb/s was 
stable result.

Do you have any suggestion how to use my new card in AP mode with full 
performance of 802.11n mode? Here is my hostapd.config file:

interface=wlan0
driver=nl80211
ieee80211n=1
ht_capab=[HT40-][SHORT-GI-40][DSSS_CCK-40][AMPDU]
hw_mode=g
channel=5
wme_enabled=1
wme_ac_bk_cwmin=4
wme_ac_bk_cwmax=10
wme_ac_bk_aifs=7
wme_ac_bk_txop_limit=0
wme_ac_bk_acm=0
wme_ac_be_aifs=3
wme_ac_be_cwmin=4
wme_ac_be_cwmax=10
wme_ac_be_txop_limit=0
wme_ac_be_acm=0
wme_ac_vi_aifs=2
wme_ac_vi_cwmin=3
wme_ac_vi_cwmax=4
wme_ac_vi_txop_limit=94
wme_ac_vi_acm=0
wme_ac_vo_aifs=2
wme_ac_vo_cwmin=2
wme_ac_vo_cwmax=3
wme_ac_vo_txop_limit=47
wme_ac_vo_acm=0
logger_syslog=-1
logger_syslog_level=0
logger_stdout=-1
logger_stdout_level=1
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=HOME_WiFi
macaddr_acl=1
accept_mac_file=/etc/hostapd/hostapd.accept
deny_mac_file=/etc/hostapd/hostapd.deny
auth_algs=1
wpa=2
wpa_passphrase=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP

If I missed important data, please let me know.

Best Regards,
Tomek

[ath9k-devel] 802.11n throughput with ath9k

[Vlada Matena]

Tomasz Czaus <tomasz_czaus <at> go2.pl> writes:

> 
> Hello,
> 
> do you get such a performance in AP mode too? I have 300Mbps TP-Link 
> TL-WN951N MIMO card an in AP mode I never get more than ~25Mb/s. Average 
> result is ~7-15Mb/s. Honestly, I am a bit disappointed because of my 
> previous card (TP-LINK with Atheros AR2413 802.11bg NIC (rev 01)) 
> provided the same performance or even better because 22-25 Mb/s was 
> stable result.
> 
> Do you have any suggestion how to use my new card in AP mode with full 
> performance of 802.11n mode? Here is my hostapd.config file:
> 
> interface=wlan0
> driver=nl80211
> ieee80211n=1
> ht_capab=[HT40-][SHORT-GI-40][DSSS_CCK-40][AMPDU]
> hw_mode=g
> channel=5
> wme_enabled=1
> wme_ac_bk_cwmin=4
> wme_ac_bk_cwmax=10
> wme_ac_bk_aifs=7
> wme_ac_bk_txop_limit=0
> wme_ac_bk_acm=0
> wme_ac_be_aifs=3
> wme_ac_be_cwmin=4
> wme_ac_be_cwmax=10
> wme_ac_be_txop_limit=0
> wme_ac_be_acm=0
> wme_ac_vi_aifs=2
> wme_ac_vi_cwmin=3
> wme_ac_vi_cwmax=4
> wme_ac_vi_txop_limit=94
> wme_ac_vi_acm=0
> wme_ac_vo_aifs=2
> wme_ac_vo_cwmin=2
> wme_ac_vo_cwmax=3
> wme_ac_vo_txop_limit=47
> wme_ac_vo_acm=0
> logger_syslog=-1
> logger_syslog_level=0
> logger_stdout=-1
> logger_stdout_level=1
> dump_file=/tmp/hostapd.dump
> ctrl_interface=/var/run/hostapd
> ctrl_interface_group=0
> ssid=HOME_WiFi
> macaddr_acl=1
> accept_mac_file=/etc/hostapd/hostapd.accept
> deny_mac_file=/etc/hostapd/hostapd.deny
> auth_algs=1
> wpa=2
> wpa_passphrase=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> wpa_key_mgmt=WPA-PSK
> wpa_pairwise=CCMP
> 
> If I missed important data, please let me know.
> 
> Best Regards,
> Tomek
> 

Hello,

I have TL-WN951N connected to D945GCLF motherboard. The PC is home router and 
NAS. I am running the card in AP mode. I am getting speeds about 250Mb/s but 
just for a few second then speed drop to few kb/s and later to zero.

Connection is very unstable. In fact it is unusable. I have to switch to pure g 
mode with ieee80211n=0. Even then the speed is unstable, but it works just a bit 
slower than old 80211g card. Also removing the ht_capab line worths trying.

I am suspecting the card to be defect as its chipset AR5416 + AR2133 should be 
supported by ath9k driver. And it often(once a minute if under load) writes 
lines like:
   ath: Failed to stop TX DMA in 100 msec after killing last frame
   ath: Failed to stop TX DMA. Resetting hardware!
and
   ath: beacon queue 9 did not stop?

Does your card also freeze time to time?
Does it writes messages about TX DMA?

I ma using 2.6.35 kernel (wireless-testing git makes no change) and hostapd 
0.7.2.

Sorry for my english. I have problems writing my native language.

Vlada

[ath9k-devel] 802.11n throughput with ath9k

[Peter Stuge]

Vlada Matena wrote:
> Connection is very unstable. In fact it is unusable.
..

> I am suspecting the card to be defect as its chipset AR5416 +
> AR2133 should be supported by ath9k driver.

Should, but I don't believe the driver works very well with the older
ath9k hardware. Most if not all focus is on the very latest hardware.


> Does your card also freeze time to time?

Yes.


> Does it writes messages about TX DMA?

Yes.


I've just started using an AR9280 card instead of my AR5416, but it's
too soon to comment on if it works substantially better for me.
Others have solid success with these cards, so I hope for the best!


//Peter

[ath9k-devel] 802.11n throughput with ath9k

[Vlada Matena]

Peter Stuge <peter <at> stuge.se> writes:

> I've just started using an AR9280 card instead of my AR5416, but it's
> too soon to comment on if it works substantially better for me.
> Others have solid success with these cards, so I hope for the best!

Thank for info. I can move this card to client running Windows and buy something 
else for AP.

[ath9k-devel] 802.11n throughput with ath9k

[Ezra Clark]

I've seen sparse reports of individuals getting in excess of 100mbps (tcp)
with atheros cards using ath9k. It seems almost everyone tops out at
~80mbps, this isn't just limited to minipci modules, most consumer level
hardware using similar chips also tops out in this range (see
http://www.smallnetbuilder.com/index.php?option=com_wireless&Itemid=&chart=79).

So what is the bottleneck here? Are the drivers not mature enough? tx/rx
rates/power not high enough? I was wondering how enterprise routers such as
the Aruba AP-125 and Ruckus 7962 are capable of achieving sustained speeds
well into the 100mbps range, and whether it was the drivers or the hardware
that was making the biggest difference.

Also, what is the reason for the 5 ghz band giving less performance (max
throughput) than 2.4 ghz? I've only noticed this in the SOHO routers and
minipci chips, the enterprise routers all perform significantly better in
the 5ghz range (which makes more intuitive sense to me).

I'm in the process of building my own router with a minipci card (thinking
about microtik R52Hn which uses an AR9220) and I was hoping to achieve rates
above 100mbps, but I wanted to know how it all comes together first.

Ezra
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[ath9k-devel] 802.11n throughput with ath9k

[Duy Nguyen]

I get up to 196Mbps with AR5416+AR2133 cards and D-link 825 AP.  I
notice it also depends on the AP hardware as well(I  tried different
ones before settling with D-link 825). I never tried R52Hn but R52n
works quite well for me.

Duy

On Tue, May 11, 2010 at 10:30 PM, Ezra Clark <paperkut@gmail.com> wrote:
> I've seen sparse reports of individuals getting in excess of 100mbps (tcp)
> with atheros cards using ath9k. It seems almost everyone tops out at
> ~80mbps, this isn't just limited to minipci modules, most consumer level
> hardware using similar chips also tops out in this range (see
> http://www.smallnetbuilder.com/index.php?option=com_wireless&Itemid=&chart=79
> ).
>
> So what is the bottleneck here? Are the drivers not mature enough? tx/rx
> rates/power not high enough? I was wondering how enterprise routers such as
> the Aruba AP-125 and Ruckus 7962 are capable of achieving sustained speeds
> well into the 100mbps range, and whether it was the drivers or the hardware
> that was making the biggest difference.
>
> Also, what is the reason for the 5 ghz band giving less performance (max
> throughput) than 2.4 ghz? I've only noticed this in the SOHO routers and
> minipci chips, the enterprise routers all perform significantly better in
> the 5ghz range (which makes more intuitive sense to me).
>
> I'm in the process of building my own router with a minipci card (thinking
> about microtik R52Hn which uses an AR9220) and I was hoping to achieve rates
> above 100mbps, but I wanted to know how it all comes together first.
>
> Ezra
>
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