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ath9k (AR5008) in AP mode - very poor performance
Hello,
I'm trying to setup Linux wireless router. I'm using hostapd with DWA-547 to setup wireless access point. The performance of DWA-547 is really very poor. The card actually performs better in 802.11g mode which doesn't make any sense. 802.11n mode with channel width 20/40MHz slows down the whole system, even ssh becomes glitchy (text input lags). top shows 90-98% idle. Signal strength is 81%. I'm using channel 9 everybody else in visible range is using channel 1. Does anyone else experience performance slow down in 802.11n mode and/or knows the cause of this? SeedTest.net and 20 pings to router when idle results: DWA-547 802.11g down 20.81 Mb/s up 20.16 Mb/s Minimum = 0ms, Maximum = 2ms, Average = 0ms DWA-547 802.11n channel width 20 MHz down 16.22 Mb/s up 13.72 Mb/s Minimum = 0ms, Maximum = 3ms, Average = 1ms DWA-547 802.11n channel width 20/40 MHz down 3.48 Mb/s up 1.76 Mb/s Minimum = 13ms, Maximum = 207ms, Average = 57ms Just for reference DIR-655 results DIR-655 802.11n channel width 20 MHz down 66.51 Mb/s up 39.57 Mb/s Minimum = 0ms, Maximum = 2ms, Average = 0ms System: OS: Linux ipfire 2.6.32.15-ipfire #1 SMP Tue Jun 29 21:04:08 GMT 2010 i686 athlon-4 i386 GNU/Linux Compat-wireless 2.6.34 AMD Athlon (don't remember actual numbers but the clock is above 1GHZ) 512MB RAM DLink DWA-547(atheros chipset) wireless PCI card 2x Realtek LAN card hostapd.conf: Code:
driver=nl80211 |
same problem
same problem here. i have an ubuntu 10.10 x64 desktop setup as a router, ap, nas, htpc.
over wired network it works well, achieves maximum speed that it's provided by ISP. But when i try to copy files drom NAS over wireless, or stream movies the ubuntu pc can't be used, text imput and mouse start to lag. maximum throughput on laptop in wireless n mode 2MB/s with an 4965AGN intel wifi card. with a wireless router i got 8-10MB/s with this intel card, with speedtest.net i get max 1mbps download instead of 3mbps (just over wireless, wired works). i tryed several kernels,stoc hostapd 0.61(max throughput 700-800k over network), and then hostapd 0.73(2MB/s lan-wireless copy) config: wireless card: tplink TL-WN951N ar5008 3tx3r ubuntu x64 10.10 kernel 2.6.35-24-generic mb gigabyte g41mft-us2h celeron dual core E3200 2gb ddr3 dual ch 1tb wd black hosapd 0.7.3 tryed many hosapd config's siple an complex this workt best 'till now hostapd conf: interface=wlan1 driver=nl80211 #bridge=br0 country_code=RO hw_mode=g channel=6 ieee80211n=1 ssid=Ubuntu_AP ctrl_interface=/var/run/hostapd ctrl_interface_group=0 #beacon_int=100 #dtim_period=2 ignore_broadcast_ssid=0 macaddr_acl=1 accept_mac_file=/etc/hostapd/accept #wpa=2 #wpa_key_mgmt=WPA-PSK #wpa_pairwise=TKIP CCMP #wpa_passphrase=12345678 ht_capab=[HT40+][SHORT-GI-40][LDPC][GF][DELAYED-BA][DSSS_CCK-40][MAX-AMSDU-7935][TX-STBC][RX-STBC123] wmm_enabled=1 # Low priority / AC_BK = background 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 # Normal priority / AC_BE = best effort 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 # High priority / AC_VI = video 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 # Highest priority / AC_VO = voice 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 |
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