Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 7 Nov 2002 17:43:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 7 Nov 2002 17:43:09 -0500 Received: from deimos.hpl.hp.com ([192.6.19.190]:5843 "EHLO deimos.hpl.hp.com") by vger.kernel.org with ESMTP id ; Thu, 7 Nov 2002 17:43:08 -0500 Date: Thu, 7 Nov 2002 14:47:50 -0800 To: Linux kernel mailing list , rmk@arm.linux.org.uk Cc: Martin Diehl Subject: [Serial 2.5]: packet drop problem (FE ?) Message-ID: <20021107224750.GA699@bougret.hpl.hp.com> Reply-To: jt@hpl.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i Organisation: HP Labs Palo Alto Address: HP Labs, 1U-17, 1501 Page Mill road, Palo Alto, CA 94304, USA. E-mail: jt@hpl.hp.com From: Jean Tourrilhes Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1723 Lines: 47 Hi, I've got two identical boxes (dual P6 200MHz) talking to each other through serial IrDA dongles (each attached to the first serial port). One side has 2.4.20-pre8 : ------------------------------- # cat /proc/tty/driver/serial serinfo:1.0 driver:5.05c revision:2001-07-08 0: uart:16550A port:3F8 irq:4 baud:9600 tx:5249946 rx:120379 RTS|DTR 1: uart:16550A port:2F8 irq:3 tx:0 rx:0 ------------------------------- The other side has 2.5.46 : ---------------------------- # cat /proc/tty/driver/serial serinfo:1.0 driver revision: 0: uart:16550A port:000003F8 irq:4 tx:19541287 rx:14370938 fe:1384 RTS|DTR 1: uart:16550A port:000002F8 irq:3 tx:39761 rx:3 RTS|DTR [...] # setserial -a /dev/ttyS0 /dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4 Baud_base: 115200, close_delay: 500, divisor: 0 closing_wait: 30000 Flags: spd_normal skip_test ---------------------------- Problem : a noticeable number of large packet from 2.4.X to 2.5.X are dropped (and retransmitted), whereas almost no packet from 2.5.X to 2.4.X are dropped. I tried swapping the IrDA dongles themselves, and this didn't make any difference. No other device/driver is using irq4. I also try using a FIR as a sender, and I still see this packet dropped in Rx in 2.5.X. And this used to work properly way back when I had 2.4.X on this box. I'm kind of suspicious about the "fe" number above. Could anybody tell me a bit more about what "fe" means ? Thanks... Jean - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/