From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 31 Oct 2002 15:31:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 31 Oct 2002 15:31:36 -0500 Received: from nwd2mime2.analog.com ([137.71.25.114]:23050 "EHLO nwd2mime2.analog.com") by vger.kernel.org with ESMTP id ; Thu, 31 Oct 2002 15:31:35 -0500 Message-ID: <3DC1949A.B1B862A1@analog.com> Date: Thu, 31 Oct 2002 12:37:46 -0800 From: Justin Wojdacki Reply-To: justin.wojdacki@analog.com Organization: Analog Devices, Communications Processors Group X-Mailer: Mozilla 4.75 [en] (X11; U; SunOS 5.8 sun4u) X-Accept-Language: en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Serial Port Speed Change, 2.4.10->2.4.16 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Probably a dumb question, but I have a MIPS-based system that I'm running Linux on, and when moving from 2.4.10 kernel to 2.4.16 kernel, the # of characters per second on the serial console has dropped significantly. The serial port used is a 16450 clone (it's built in to the processor, so no, I can't upgrade it). It's programmed to run at 9600 baud, 8N1. There's clearly no problem with the characters themselves. But while I can push ~1000 CPS under 2.4.10, I can only push ~100 CPS under 2.4.16. I've noticed that the CPS of the console is constant in 2.4.16, regardless of serial port speed. Can anyone lend any insight into why I would've lost 90% of my serial port throughput moving between these two revs of the kernel? -- ------------------------------------------------- Justin Wojdacki justin.wojdacki@analog.com (408) 350-5032 Communications Processors Group -- Analog Devices