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hermes_jr
l33t
l33t


Joined: 26 Feb 2004
Posts: 701
Location: Moscow, Russia

PostPosted: Wed Feb 16, 2011 8:52 pm    Post subject: ath5k + hostapd too slow Reply with quote

Hello.
I've been using this configuration for a couple of months and everything works almost fine, and there are no link/auth failures. But recently I noticed that the speed isn't good enough and I don't get why. Could you please give me an advice guys?

Hardware: access point is Gentoo router with D-Link DWA-520 and D-Link ANT24-0700 antenna
lspci: 01:09.0 Ethernet controller: Atheros Communications Inc. Atheros AR5001X+ Wireless Network Adapter (rev 01)
client is - MacBookPro7,1 with AirPort Extreme Broadcom BCM43xx 1.0 (5.10.131.36.1) onboard.

Laptop and antenna are on the line of sight and close to each other.

Router configs:
/usr/src/linux/.config:

#Linux hoop 2.6.37-gentoo #3 Wed Feb 16 15:18:06 MSK 2011 i686 Intel(R) Celeron(R) CPU 2.26GHz GenuineIntel GNU/Linux

# just stripped out interesting options
CONFIG_ATH_COMMON=m
CONFIG_ATH5K=m
CONFIG_ATH9K_HW=m
CONFIG_ATH9K_COMMON=m
CONFIG_ATH9K=m
CONFIG_ATH9K_RATE_CONTROL=y

CONFIG_WIRELESS=y
CONFIG_WIRELESS_EXT=y

CONFIG_CRYPTO_HMAC=y
CONFIG_CRYPTO_AES=y

CONFIG_VLAN_8021Q=m
CONFIG_VLAN_8021Q_GVRP=y
CONFIG_CFG80211=m
CONFIG_CFG80211_DEFAULT_PS=y
CONFIG_LIB80211=y
CONFIG_LIB80211_CRYPT_WEP=y
CONFIG_LIB80211_CRYPT_CCMP=y
CONFIG_LIB80211_CRYPT_TKIP=y
CONFIG_MAC80211=m
CONFIG_MAC80211_HAS_RC=y
CONFIG_MAC80211_RC_MINSTREL=y
CONFIG_MAC80211_RC_MINSTREL_HT=y
CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y
CONFIG_MAC80211_RC_DEFAULT="minstrel_ht"
CONFIG_MAC80211_LEDS=y


/etc/conf.d/net:

modules="iproute2 !iwconfig !wpa_supplicant"

metric_wlan0="100"
config_wlan0="10.13.14.1/24 brd 10.13.14.255"
routes_wlan0="10.13.14.0/24 dev wlan0 src 10.13.14.1 table intwifi"
mode_wlan0="master"


/etc/hostapd/hostapd.conf:

interface=wlan0
driver=nl80211
logger_syslog=-1
logger_syslog_level=4
logger_stdout=-1
logger_stdout_level=2
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=myssid
country_code=RU
ieee80211d=1
hw_mode=g
channel=3
beacon_int=100
dtim_period=2
max_num_sta=255
rts_threshold=2347
fragm_threshold=2346
# I've tried to uncomment the following lines, but there's no difference
#supported_rates=180 480 540
#basic_rates=240 540
macaddr_acl=1
accept_mac_file=/etc/hostapd/hostapd.accept
deny_mac_file=/etc/hostapd/hostapd.deny
auth_algs=1
ignore_broadcast_ssid=1
#Turned off the following parameter, but no difference either
wmm_enabled=1
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0
eapol_key_index_workaround=0
eap_server=0
own_ip_addr=127.0.0.1
wpa=3
wpa_passphrase=MasK3DPa$$phras3
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP


Everything works stable with minor packet loss while flooding, but throughput is very poor:
Code:

 $ sudo ping -s 1400 -f 10.13.14.1
PING 10.13.14.1 (10.13.14.1): 1400 data bytes
..Request timeout for icmp_seq 3594
..Request timeout for icmp_seq 3600
..Request timeout for icmp_seq 3619
.Request timeout for icmp_seq 3620
..Request timeout for icmp_seq 10887
.^C
--- 10.13.14.1 ping statistics ---
11406 packets transmitted, 11400 packets received, 0.1% packet loss
round-trip min/avg/max/stddev = 0.710/4.523/38.124/2.845 ms


Code:

iperf -i 5 -t 40 -c 10.13.14.10 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 10.13.14.10, TCP port 5001
TCP window size: 22.6 KByte (default)
------------------------------------------------------------
[  3] local 10.13.14.1 port 53491 connected with 10.13.14.10 port 5001
[  5] local 10.13.14.1 port 5001 connected with 10.13.14.10 port 49440
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0- 5.0 sec  4.71 MBytes  7.91 Mbits/sec
[  3]  0.0- 5.0 sec  3.12 MBytes  5.24 Mbits/sec
[  5]  5.0-10.0 sec  3.75 MBytes  6.30 Mbits/sec
[  3]  5.0-10.0 sec  3.75 MBytes  6.29 Mbits/sec
[  5] 10.0-15.0 sec  3.79 MBytes  6.36 Mbits/sec
[  3] 10.0-15.0 sec  3.75 MBytes  6.29 Mbits/sec
[  5] 15.0-20.0 sec  3.84 MBytes  6.43 Mbits/sec
[  3] 15.0-20.0 sec  3.88 MBytes  6.50 Mbits/sec
[  5] 20.0-25.0 sec  3.83 MBytes  6.42 Mbits/sec
[  3] 20.0-25.0 sec  3.88 MBytes  6.50 Mbits/sec
[  5] 25.0-30.0 sec  4.47 MBytes  7.50 Mbits/sec
[  3] 25.0-30.0 sec  4.50 MBytes  7.55 Mbits/sec
[  3] 30.0-35.0 sec  3.38 MBytes  5.66 Mbits/sec
[  5] 30.0-35.0 sec  3.42 MBytes  5.74 Mbits/sec
[  5] 35.0-40.0 sec  3.99 MBytes  6.70 Mbits/sec
[  5]  0.0-40.0 sec  31.8 MBytes  6.67 Mbits/sec
[  3] 35.0-40.0 sec  4.12 MBytes  6.92 Mbits/sec
[  3]  0.0-40.1 sec  30.5 MBytes  6.37 Mbits/sec

Bandwidth is always under 10-15 Mbits while it should be around 54 Mbits (G mode)!

There are some wireless networks nearby, but it seems like they're not interfere much with mine (also changing channel to 3 or 11 doesn't make any progress)
Chart 1
Chart 2 (the grey filled one is mine)

What should I check to solve this speed issue?
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gerdesj
l33t
l33t


Joined: 29 Sep 2005
Posts: 621
Location: Yeovil, Somerset, UK

PostPosted: Fri Feb 18, 2011 12:59 am    Post subject: Re: ath5k + hostapd too slow Reply with quote

Are you able to get any insight as to a possible maximum throghput?

For example you might want to try a Windows/OSX/ based system to see if you can get a better or worse figure to compare with.

In the end you have a sample size of one to play with - you need to expand that sample size. You need contrast. It would be rude of us to ask for you to replace your AP but I think a contrast of clients is reasonable.

Cheers
Jon
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celticsoul
n00b
n00b


Joined: 04 Dec 2006
Posts: 16

PostPosted: Sat Mar 31, 2012 3:39 pm    Post subject: Reply with quote

I have the same problem but my hardware configuration is different.
I have an rt73usb with hostapd 0.7.3, vanilla kernel 3.2.6 x86_64
interface=wlan0
driver=nl80211
bridge=br0

country_code=SG
ieee80211d=1

ssid=xxxxxx
hw_mode=g
channel=11
wme_enabled=1

macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=xxxxxxx
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

I have tried to connect from my Android phone as well as my MacBook but the max speed that I can get is less than 300KBps for LAN file transfer
There is no channel overlap.
Any help woull be appreciated.
Thanks
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