From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mtiwmhc12.worldnet.att.net ([204.127.131.116]:40528 "EHLO mtiwmhc12.worldnet.att.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750779AbZCKTlg (ORCPT ); Wed, 11 Mar 2009 15:41:36 -0400 Message-ID: <49B813E9.8050108@lwfinger.net> (sfid-20090311_204143_512517_BE5C44E9) Date: Wed, 11 Mar 2009 14:41:29 -0500 From: Larry Finger MIME-Version: 1.0 To: "P.G. Richardson" CC: linux-wireless@vger.kernel.org Subject: Re: rtl8187 - nice work! References: <50533.82.152.175.172.1236798263.squirrel@www.phantomjinx.co.uk> In-Reply-To: <50533.82.152.175.172.1236798263.squirrel@www.phantomjinx.co.uk> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: P.G. Richardson wrote: > Hi, > > Installed the compat-wireless-2009-03-10 and the speed has greatly > improved. Thanks very much. > > I do have some observations that might be a bug or just configuration. > > When powering up, the wireless decided on 54M as its bit rate. > Consequently, tcp was patchy at best - losing packets whilst pinging, ssh > failing to connect. Setting the rate back to a fixed 11M solves this and > gives good speed. Interestingly, performance declines as I up the bit rate > from 11 to 18 etc... It is probably a bug. My Netgear WG111V2 with an RTL8187L chip is perfectly happy running at 48 or 54 Mb/s with a transmit throughput of 21-23 Mb/s - close to the maximum for an 802.11g network. There are, however, other reports like yours where the OFDM rates (6, 9, 18, 24, 36, 48, and 54 Mb/s) don't work very well. It seems that not all 8187's are the same. What rate-setting algorithm are you using? Use 'dmesg | grep rate' to see that. I would have expected it to have settled into 11 Mb/s. Perhaps the auto retry hasn't really been turned off. Larry