Hi, we are currently evaluating Netgear WNA1100 USB sticks for use in conjunction with an ARM based embedded device. For our tests we used the ath9k_htc driver from compat-wireless 3.2.5-1. The sticks are connected to a USB 1.1 OHCI controller. Our tests consist of an endless loop of ping, iperf and wget to a PC connected to the AP (AVM FRITZ!Box 7270 v3, 6m away) via ethernet. The WPA2 connection uses TKIP for the group cipher and CCMP for the pairwise cipher. While the connections are stable over weeks when there is just one device, the sticks tend to lock up after about 1-2 days when two devices are competing for airtime. There are a handfull of networks around, but there is little traffic besides our tests. I have seen two different lock ups: 1. - USB analyzer shows all packets being NAK'ed by the stick - OHCI controller endlessly repeats the same packet - Driver queues more and more URBs - Kernel runs out of memory, OOM killer goes on a rampage - System sometimes recovers a few minutes after removing the stick 2. - Connection apparently dropped due to timeout - TCP connects fail with "no route to host" - scanning for networks yields no results - USB analyzer shows requests still being answered. - tcpdump/airodump-ng show not a single packet being received - reloading ath9k_htc.ko does not help Are these known problems and can I do anything to help analyze and fix them? Shall I create logs with a specific debugging mask? The goal is to allow the end user to not have to touch the device for years, so a lock up every two days is a no-go. Is the AR9271 a good choice for stable connections? Do you know of other current chipsets with better stability? Best regards, Daniel -- Dipl.-Math. Daniel Glöckner, emlix GmbH, http://www.emlix.com Fon +49 551 30664-0, Fax +49 551 30664-11, Bertha-von-Suttner-Straße 9, 37085 Göttingen, Germany Sitz der Gesellschaft: Göttingen, Amtsgericht Göttingen HR B 3160 Geschäftsführer: Dr. Uwe Kracke, Ust-IdNr.: DE 205 198 055 emlix - your embedded linux partner -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
