From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin LaHaise Date: Fri, 14 Oct 2011 11:29:40 -0400 Subject: [ath9k-devel] persistent 5% packet loss with ath9k Message-ID: <20111014152940.GP10838@kvack.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org Hello all, I'm getting a persistent 5% packet loss with ath9k. The card is a D-Link DWA-552 (see below for lspci -vvv results). The link is to an 802.11n access point on the other side of the house, and iwconfig shows some count for Tx excessiv retries. The catch is that using an Intel 802.11n card from the same location doesn't result in any significant packet loss (<1%). Any ideas? I'm currently running 3.1.0-rc9+, but I see the same results with Fedora 15 kernels (2.6.38.6-26.rc1.fc15.x86_64 and 2.6.40.6-0.fc15.x86_64@least, haven't tested any other kernels). Note that I'm living in a rural area, and there is nothing else using the 2.4GHz spectrum around here, so 116ms ping times are quite unexpected and seem to point to a problem with ath9k. -ben ping -c 200 -s 3000 x.x.x.x ... --- x.x.x.x ping statistics --- 200 packets transmitted, 190 received, 5% packet loss, time 199200ms rtt min/avg/max/mdev = 2.173/6.923/116.171/8.855 ms wlan1 IEEE 802.11bgn ESSID:"test3" Mode:Managed Frequency:2.462 GHz Access Point: 00:xx:xx:xx:xx:xx Bit Rate=48 Mb/s Tx-Power=27 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=41/70 Signal level=-69 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:73 Invalid misc:62 Missed beacon:0 09:01.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01) Subsystem: D-Link System Inc DWA-552 802.11n Xtreme N Desktop Adapter (rev A1) Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR-