From owner-freebsd-mobile Sun Jul 14 16:37:54 2002 Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E227F37B400 for ; Sun, 14 Jul 2002 16:37:52 -0700 (PDT) Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2657643E31 for ; Sun, 14 Jul 2002 16:37:52 -0700 (PDT) (envelope-from imp@bsdimp.com) Received: from localhost (warner@rover2.village.org [10.0.0.1]) by harmony.village.org (8.12.3/8.12.3) with ESMTP id g6ENbj1f003834; Sun, 14 Jul 2002 17:37:45 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Sun, 14 Jul 2002 17:37:29 -0600 (MDT) Message-Id: <20020714.173729.55199580.imp@bsdimp.com> To: geekvinod@yahoo.com Cc: freebsd-mobile@FreeBSD.ORG Subject: Re: wi TX rate mechanism From: "M. Warner Losh" In-Reply-To: <20020714190625.79562.qmail@web21108.mail.yahoo.com> References: <20020714190625.79562.qmail@web21108.mail.yahoo.com> X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org In message: <20020714190625.79562.qmail@web21108.mail.yahoo.com> Vinod writes: : Hi there all.I had a question about the wi TX : mechanism. I have observed that sometimes the TX rate : of my wi card fluctuates between 11Mbps, 6Mbps and : 2Mbps.Why does this happen? Shit happens :-). It does this because singal strength fluxuates, and other factors I've not been able to entirely understand. : if its due to interference why should the TX rate be : affected?shouldnt just the receiving station be : affected? No, both ends have to agree on how they are talking to the other end. That negotiation is done at a very low level. : Was wondering if the receiving station tells the : sender to slow down.does it? Yes. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message