From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 1 Apr 2001 20:50:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 1 Apr 2001 20:50:50 -0400 Received: from tisch.mail.mindspring.net ([207.69.200.157]:10025 "EHLO tisch.mail.mindspring.net") by vger.kernel.org with ESMTP id ; Sun, 1 Apr 2001 20:50:34 -0400 Message-ID: <003001c0bb0e$100149b0$08080808@zeusinc.com> From: "Tom Sightler" To: "Trever L. Adams" , "Mark Hahn" Cc: "linux Kernel" In-Reply-To: <3AC7B54C.2010706@bigfoot.com> Subject: Re: Serial, 115Kbps, 2.2, 2.4 Date: Sun, 1 Apr 2001 20:44:22 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Actually, I do have a similar problem that I've been unable to track down 100%. Under 2.4.x when I run the modem on my Xircom Cardbus 10/100 Ethernet/56K Modem combo card (installed in a Dell 5000e with 650Mhz Pentium III) I get a fair number of dropped packets at 115Kbps, enough to cause problems and a significant speed decrease. Simply dropping the serial port rate to 56K seems to solve the problem. I'm actually suspicious that the hardware handshaking isn't working quite right, but I haven't take the time to look at it. I never noticed the problem under 2.2.x, but the last kernel I ran from that era was the 2.2.16 kernel included with Redhat 7. I've really not looked at it very hard, backing the speed down to 56K was a good enough solution for me for now, the Xircom has such a troublesome history that I just blamed it on that but your report makes me more curious. Later, Tom