On Friday 31 December 2010 14:40:38 Chin Shi Hong wrote: > On Thu, Dec 30, 2010 at 9:54 PM, Chin Shi Hong <cshong87@xxxxxxxxx> wrote: > > On Fri, Dec 31, 2010 at 7:27 AM, Christian Lamparter > > <chunkeey@xxxxxxxxxxxxxx> wrote: > >> On Thursday 30 December 2010 16:55:18 Chin Shi Hong wrote: > >>> Wireless adapter model: TP-LINK WN821NC (USB 300Mbps Wireless N adapter) > >>> Output of lsusb: Bus 001 Device 007: ID 0cf3:1002 Atheros > >>> Communications, Inc. TP-Link TL-WN821N v2 [Atheros AR9001U-(2)NG] > >>> Wireless router: TP-LINK W8960N (300Mbps Wireless N router) > >> > >> That's weird, according to TP-Link's website there wasn't any WN821NC > >> with a WN821N v2. They "only" let you download the driver for > >> WN821N v3. v3 very different from the previous v2 generation, it has > >> new chips (AR7015+AR9287?) and needs the ath9k_htc driver. > > > > WN821NC is actually WN821N shipped with USB cradle. WN821N itself does > > not ship with any USB Cradle. The character 'C' in WN821NC mean > > "Cradle". If you purchase WN821N, you will not get any USB Cradle. > > But, if you purchase WN821NC, what you get is actually WN821N + USB > > Cradle. I went the extra mile. Got the windows driver for WN821NC and installed it (under wine, if that makes a difference?) and guess what... it's only for ath9k_htc. So why would TP-Link sabotage themselves and only provide the wrong driver for all windows customers? But anyway, it's your stuff that does not work :D. > > Are you sure, you didn't get ripped off here and someone else > >> has "your" v3? > > > > According to the information printed at the back of my wireless > > adapter, it is WN821N v2. Yeah, I found someone on ebay, flogging cradles with WN821Nv2. > >>> Driver name ar9170usb > >>> Linux distro: Ubuntu 10.10 64 bit > >>> Kernel version: 2.6.35-24-generic > >>> > >>> If I use Ndiswrapper + Windows XP driver, I can get full 300Mbps. > >> Have you measured that (with iperf/netperf)? Or is it just the > >> "Connection Information" pop-up which simply displays "speed: 300 Mbits" ? > > > > The 300Mbps is just "display". But, when I test my speed on Windows XP > > with jperf, it ever reach maximum 2xxMbps. "It >N<ever reaches the maximum of 200 Mbps?" Wasn't there something abour wireless PHY vs. TCP speeds in the "802.11 capturing project"? I've been looking around for benchmarks for comparisons While I did not find anything with a WN821N v2, there is one rather nice review with several adapters, including a Netgear WN111v2. The WN111v2 has definitely the same chip and driver, I can't say much about the "design" though, but it should be similar as well. <http://www.smallnetbuilder.com/wireless/wireless-reviews/31089-80211n-adapter-roundup> Yup, a very bleak picture. > >>> At the same distance, if I use ar9170usb driver, I can only get > >>> maximum 54Mbps speed. > >> That's true. here's ar9170usb wiki page: > >> <http://wireless.kernel.org/en/users/Drivers/ar9170#features> => working > >> "802.11 a/b/g" > >> > >> -- > >> > >> The quickest way around limitations is via backports: > >> visit <http://wireless.kernel.org/en/users/Download> > >> and get compat-wireless: > >> > > Will try carl9170 again later. Huh, so have have tried carl9170 before? > carl9170 not work. Error when trying to run "sudo modprobe carl9170": > "FATAL: Error inserting carl9170 > (/lib/modules/2.6.35-22-generic/updates/drivers/net/wireless/ath/carl9170/carl9170.ko): > Invalid argument". hint: "dmesg" tells you more. I can only guess that "Invalid argument" actually means in this context, but it could be related to old/incompatible modules. Try to reload the ath, mac80211 and cfg80211 modules. Regards, Chr -- 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
