From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp5-g19.free.fr ([212.27.42.35]:33964 "EHLO smtp5-g19.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752707AbYGZQcj convert rfc822-to-8bit (ORCPT ); Sat, 26 Jul 2008 12:32:39 -0400 Received: from smtp5-g19.free.fr (localhost.localdomain [127.0.0.1]) by smtp5-g19.free.fr (Postfix) with ESMTP id 3D4793F6236 for ; Sat, 26 Jul 2008 18:32:38 +0200 (CEST) Received: from localhost (ble59-5-82-233-204-229.fbx.proxad.net [82.233.204.229]) by smtp5-g19.free.fr (Postfix) with ESMTP id EE0903F6226 for ; Sat, 26 Jul 2008 18:32:37 +0200 (CEST) Date: Sat, 26 Jul 2008 18:32:37 +0200 From: =?UTF-8?B?Q8OpZHJpYw==?= Auger Cc: linux-wireless@vger.kernel.org Subject: Re: iwl3945 slow for downloading Message-ID: <20080726183237.02a1e28e@grisbi.org> (sfid-20080726_183258_392670_CB4D6FB4) In-Reply-To: <488B48C1.6090506@lwfinger.net> References: <20080726161140.59041730@grisbi.org> <488B3969.4050405@openwrt.org> <488B48C1.6090506@lwfinger.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 To: unlisted-recipients:; (no To-header on input) Sender: linux-wireless-owner@vger.kernel.org List-ID: Le Sat, 26 Jul 2008 10:54:41 -0500, Larry Finger a =C3=A9crit : > Felix Fietkau wrote: > > I don't know if it helps with debugging this issue, but I've seen > > the same on a laptop from a friend of mine (same card). > >=20 > > After some searching I found that setting the AP to g-only mode > > instead of b+g mixed made it work at decent speeds. Another symptom > > of this slowdown is that there is typically an unnaturally high > > number of retransmissions on the air, which eats up a lot of > > airtime. > >=20 > > I've spent some time looking through the code to find the reason > > for this but couldn't find anything yet (maybe somebody from Intel > > could help). >=20 > Just for comparison, my BCM4312 running b43 from the latest > wireless-testing gets the following tcpperf throughput: >=20 > AP Mode TX RX >=20 > Mixed b/g 19.8 MB/s 23.0 MB/s > g-only 20.5 MB/s 23.1 MB/s >=20 > For these tests, the connecting end was wired to the router. The > difference in TX speeds was about what I expected - the small > difference in RX speeds was not. In any case, if you see a large > difference with iwl3945, that would be useful information. >=20 > You can obtain tcpperf from > http://wand.cs.waikato.ac.nz/~stj2/nsc/software.html hello thanks for your answers. i tried to set my ap to g-only, but i cannot :-( the wifi box is given by my provider and it seems cannot be changed... so i tried tcpperf, this is the result : cedric:/home/grisbi/tcpperf-1.754# ./tcpperf -c 192.168.0.4 -t 30 Duration: 30 9482usec Bytes sent: 5481472 (5353 kB 5 MB 0 GB) Bandwidth: 1461264 b/s (1461.26 kb/s 1.46 Mb/s) Close duration: 0s 22usec then i tried to download an image of ubuntu and i had about 900kb/s, so very good and i don't understand... then i tried to send a big file with scp to the other computer, as user and as root, it begins at 2,2MB/s and decrease untill 150kb/s and stays between 130-200kb/s i did again a tcpperf with -t 300 to check if it's not with the time, but i have 1,30MB/s, seems correct. second test : i stop the wifi and plug a cable. the second computer is still in wifi. tcpperf gives me 17Mb/s and the same file with scp is sent with about 2,2MB/s... so now i really don't understand, from internet, loading work untill 900kb/s (ok for me), but beween 2 computers on my network i have max 200kb/s... hopes this can be usefull thanks cedric -- To unsubscribe from this list: send the line "unsubscribe linux-wireles= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html