From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 15 Jan 2001 11:15:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 15 Jan 2001 11:15:33 -0500 Received: from aragorn.ics.muni.cz ([147.251.4.33]:64648 "EHLO aragorn.ics.muni.cz") by vger.kernel.org with ESMTP id ; Mon, 15 Jan 2001 11:15:26 -0500 Newsgroups: cz.muni.redir.linux-kernel Path: news From: Zdenek Kabelac Subject: Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware Message-ID: <3A632215.981FAE01@fi.muni.cz> Date: Mon, 15 Jan 2001 16:15:17 GMT To: Linus Torvalds X-Nntp-Posting-Host: dual.fi.muni.cz Content-Transfer-Encoding: 7bit X-Accept-Language: Czech, en Content-Type: text/plain; charset=iso-8859-2 In-Reply-To: Mime-Version: 1.0 X-Mailer: Mozilla 4.76 [en] (X11; U; Linux 2.4.0-test1-RTL3.0pre10 i686) Organization: unknown Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Linus Torvalds wrote: > > On Sat, 13 Jan 2001, Frank de Lange wrote: > > IDE is not my favourite example of a "known stable driver". Also, in many > cases IDE is for historical reasons connected to an EDGE io-apic pin (ie > it's still considered an ISA interrupt). Which probably wouldn't show this > problem anyway. I've been having similar problem with my network card 3c59x. My BP6 was hanging with 50% probablity while running netscape from nfs mounted /usr partition). For 2.2 kernel I've created this patch which has solved this problem (so I don't have any problems until recentely I've started to use UDMA4 with ATA66 - but this seems to be related to BX chipset problem and as far as I know Andre is working on this issue) While using this patch - I've got many messages about irq_enter in my kernel log, but the system was stable and running quite happy. With the latest 2.4 kernels I do not have same problems (at least it looks so far) (So I assume the problem was hidden somewhere inside NFS). However with 2.4.0 & ac patches I'm seeing some problem when one CPU is locked and the computer becomes unusable without any reason - there is no network trafick no ide intensive actions - all I can do is to move mouse within Xfree (so maybe its xfree bug - but its hard to recognize this - all I could say is that I'm not seeing such problems with -test12 kernels) Here the patch for 2.2 I've been using: --- linux.orig/arch/i386/kernel/irq.h Wed May 31 11:21:04 2000 +++ linux/arch/i386/kernel/irq.h Wed May 31 11:21:47 2000 @@ -138,8 +138,22 @@ static inline void irq_enter(int cpu, unsigned int irq) { hardirq_enter(cpu); - while (test_bit(0,&global_irq_lock)) { - /* nothing */; + if (global_irq_holder == cpu && test_bit(0, &global_irq_lock)) { + printk(KERN_WARNING "irq_enter - CPU:%d already holder (count:% + cpu, global_irq_count, local_irq_count[cpu]); + /* avoid deadlock bellow */ + clear_bit(0,&global_irq_lock); + } else { + unsigned long i = 1000000; + while (test_bit(0,&global_irq_lock) && i) { + i--; + /* nothing */; + } + if (!i) { + clear_bit(0,&global_irq_lock); + printk(KERN_WARNING "irq_enter - loop timeout CPU:%d Holder:%d! + cpu, global_irq_holder); + } } } printk(KERN_WARNING "irq_enter - loop timeout CPU:%d Holder:%d! -- There are three types of people in the world: those who can count, and those who can't. Zdenek Kabelac http://i.am/kabi/ kabi@i.am {debian.org; fi.muni.cz} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/