Return-path: Received: from nf-out-0910.google.com ([64.233.182.190]:30526 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754696AbYKTNpB (ORCPT ); Thu, 20 Nov 2008 08:45:01 -0500 Received: by nf-out-0910.google.com with SMTP id d3so225365nfc.21 for ; Thu, 20 Nov 2008 05:44:59 -0800 (PST) Message-ID: (sfid-20081120_144508_005072_4F9F8881) Date: Thu, 20 Nov 2008 14:44:58 +0100 From: "Stefan Steuerwald" To: "Johannes Berg" Subject: Re: Fwd: p54: testing AP mode: cannot switch to master mode Cc: linux-wireless@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_99801_14322473.1227188699195" References: <1227095773.26243.22.camel@johannes.berg> <1227109286.26243.54.camel@johannes.berg> <1227126204.26243.62.camel@johannes.berg> Sender: linux-wireless-owner@vger.kernel.org List-ID: ------=_Part_99801_14322473.1227188699195 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline >> What's your client? Is it using powersave? Anyone know whether >> multicast-after-dtim works correctly in p54? Or maybe there's a bug >> hitting with TIM bits? Do you have an extra card that you could use to >> monitor and see what happens when it times out? > > I have tested multiple clients at this time with my XG-601/ISL3880 p54 card: > - iPod Touch 2G with firmware 2.1.1 > - Sony Vaio with a Marvell 88E8036 (Vista SP1) > - Amilo Notebook with Intel 4965AGN (stock Ubuntu 8.10) > - Amilo Notebook with Netgear USB-WLAN-Stick with RTL8187B (stock Ubuntu 8.10) > > Interestingly, only the iPod is unusable, with constant timeouts of my > web-app. The other clients work 99% of the time with an _occasional_ > timeout. I have multiple clients connected at the same time, and never > saw a simultaneous timeout with any two clients. I have also a wired > reference connection which never exhibits any timeouts. I have attached some traffic dumps that happen between my iPod Touch and the XG-601-based AP (obtained with a RTL8187B in monitor mode): Observations: - ipod_http_request_ok.pcap shows how I would like the world to be (and how it is _occasionally_ with the iPod and _almost always_ with my other clients). We build a TCP connection, make a http request, get a TCP ACK, followed swiftly by an answer and the TCP connection closes. - Sometimes, however, the http answer does not appear immediately after the request (about 4-7 secs of delay). The gap is filled by some "Null function" packets originating on the iPod (maybe it is getting impatient?). This gets me an application-level timeout. See ipod_http_request_delayed_answer.pcap . - Then, there's a scenario that makes the iPod reset any new TCP connection until I disassociate and reassociate it to the AP (see the last two pcaps). This seems to happen whenever somebody (must be my Notebook WLAN) sends probes. The same sequence of events does not cause anything untoward with my other clients. It may be Apple's job to fix this - however, iPods work ok with many APs (including Apple's own AirPort of course) (and the latest madwifi except for annoying "stuck beacons" resulting in card resets). Any ideas? Should I forward this info to someone? Anything I should try? My goal is to make the iPod work with any decent MiniPCI card that supports AP mode. Best regards, Stefan. ------=_Part_99801_14322473.1227188699195 Content-Type: application/x-gzip; name=ipod_http_request_ok.pcap.gz Content-Transfer-Encoding: base64 X-Attachment-Id: f_fnrfr1a00 Content-Disposition: attachment; filename=ipod_http_request_ok.pcap.gz H4sICKBhJUkAA2lwb2RfaHR0cF9yZXF1ZXN0X29rLnBjYXAAlZV/aBtVHMDfJZmUC5ndKGVUwdeb ylaSXC5tli51LLGLq7R1YWvX/iFm1+Tlekt2d969jLkxCNv+2BAEUZS1E+Z/MmhRO5RKlYL/b/uj C/tjMPAPlSIDhwr7q37fSxd2Z0Iw8E3u+z3e+3x/Z+Pnb7/0oQB69tnaQkiH33T+tbff/CGI5uCZ yVUhjNCplRMvfoqkzMcffbb93IvQrVt+eN+FsnBo9ZU0Sr/wxaP1r74pgQj1HpRbebqA2c1f+7a2 diwj5AvsuC34/T5B6BL73t35E3sX8DWI2bUgeg90Jld9QHyexb/T2EV8A84BccbPaIyKcvWeG38s bAC1/+bu3puzLzWIAV+XiPwWZkSgBxgtAzQRbmKywdxoEFjk60F0Egwn20be7Y58aBXzyDc9kfeD L/dr3bXll+sINSMGP3i06x4+v597dieI/hQQl9Z87OILd1f7Gf/GOy35e2rLA5+4+UezU1jWCM07 VKXksEMcRzeNvF48pMTjSWU4cTAWGxpMvk71M8Ss0kNDsVgMj01N5WQlqoTE2chx8n6VOJQUIzM6 nU/h2cmJMUqtbXNInHaIHcloxKApPGme1ysVVU5EY3ifnjOLI3h6BI/mprGemzcNgo+dwPG8kldw RS8TPKkWmGV2BBMjUnX244xlVcgMmRvXqZyIJ6LKcFTB+8bHpiYnwo0jR0mhbO4H0JxeIXLiLWVw OCRmCgViAV6F43pBpRCgfNoxjTCm5ByVT6tnVadg6xYN4wF5ICQeJyViEzuF5yGQlCwrB+NR5QCw ksmoIj+7LzKhGlpV1Uiq4V7TnjUKZlE3tBTWzutWGBdJqQK5DYmjpmGQAsOncJkQK6JW9LNgHzMd 8M5FCYkhkbfGnXatceTec63ZckRy7hEZ2vyLtUal1zMi91eeLq7VuoWlhZFGa0Bb9LP2YJT0vXaj ka0HUQDakklr/ik3/5fNvxm/rLXk7xGW1M+bfInxt7sshuPQcsfGWUouSLxNpRSWRlWLVm1IsxTG 0pxKKbE/YHbNNIvMVNSdMujJBDxbtqnZ0NmgK6A6hFI4yNQLEjvTuMIheXLOMp2qzQGKHGf2kkNN i+mlRPQAM1iqYdrqGRVmhJkHlQRYL17k2aq3y9aRB52qZXmr9Q+vVo87W4uXebZ2CUvXP3Rni/Mf tOOnH3ZaZDHvIpP4IvvdvUgW15gPsMgu9X3vWiQSj/Jh20XWkZ/28vdy/m8t+Fc4/7v/w08/7sTP efmvcv6vLfm7ast91/7Lzz5uO61POtW/5qn/9h9a0FP/K+DDj2xar19r1n9vs/5PWtX/X04bBwHb BwAA ------=_Part_99801_14322473.1227188699195 Content-Type: application/x-gzip; 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