Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262175AbUDAHF6 (ORCPT ); Thu, 1 Apr 2004 02:05:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262471AbUDAHF6 (ORCPT ); Thu, 1 Apr 2004 02:05:58 -0500 Received: from rrzd2.rz.uni-regensburg.de ([132.199.1.12]:21686 "EHLO rrzd2.rz.uni-regensburg.de") by vger.kernel.org with ESMTP id S262175AbUDAHFz (ORCPT ); Thu, 1 Apr 2004 02:05:55 -0500 From: "Ulrich Windl" Organization: Universitaet Regensburg, Klinikum To: Denis Vlasenko Date: Thu, 01 Apr 2004 09:04:08 +0200 MIME-Version: 1.0 Subject: Re: 2.4.21 on Itanium2: floating-point assist fault at ip 400000000062ada1, isr 0000020000000008 CC: linux-kernel@vger.kernel.org Message-ID: <406BDB07.6325.3F7C64@localhost> In-reply-to: <200403311900.17293.vda@port.imtp.ilyichevsk.odessa.ua> References: <406AE0D5.10359.1930261@localhost> X-mailer: Pegasus Mail for Windows (v4.12a) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body X-Content-Conformance: HerringScan-0.25/Sophos-3.77+2.18+2.07.040+05 January 2004+87305@20040401.070341Z Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3056 Lines: 76 OK, thanks guys for the answers: It seems to be a hint that an instruction can't be done in hardware, but has to be emulated instead. I tried to find the offending code, and I was surprised that is't not a complicated function: br.few 0x400000000062aca0 0x400000000062ad70 : [MII] nop.m 0x0 0x400000000062ad71 : zxt4 r14=r44;; 0x400000000062ad72 : add r15=r35,r14 0x400000000062ad80 : [MMI] add r14=r34,r14;; 0x400000000062ad81 : ldfd f7=[r14] 0x400000000062ad82 : nop.i 0x0 0x400000000062ad90 : [MMI] ldfd f6=[r15];; 0x400000000062ad91 : nop.m 0x0 0x400000000062ad92 : nop.i 0x0 0x400000000062ada0 : [MFI] nop.m 0x0 0x400000000062ada1 : fcmp.eq.s0 p7,p6=f7,f6 <<< 0x400000000062ada2 : nop.i 0x0;; 0x400000000062adb0 : [MIB] nop.m 0x0 0x400000000062adb1 : nop.i 0x0 (when attaching to the process with gdb) Thanks and regards, Ulrich On 31 Mar 2004 at 19:00, Denis Vlasenko wrote: > On Wednesday 31 March 2004 15:16, Ulrich Windl wrote: > > Hello, > > > > I did try to find an answer is SuSE's support database, not in SAP's > > support database, and also did search Google, but could not find an answer: > > > > We run SuSE Linux Enterprise Server 8 (SLES8) on a HP rx4640 Itanium2 > > server with 2 CPUs (family: Itanium 2, model: 1, revision: 5, archrev: 0). > > > > In syslog is do see periodic kernel messages (with no implicit priority) > > that read: > > > > dw.sapC11_DVS02(14393): floating-point assist fault at ip 400000000062ada1, > > isr 0000020000000008 > > > > ("dw.sapC11_DVS02" is a SAP R/3 work process (46D_EXT, patch 1754, for > > those who care) > > > > Can anybody explain what this message means? Is it an application problem, > > or is it a kernel problem? > > static int fpu_swa_count = 0; > static unsigned long last_time; > ... > if (jiffies - last_time > 5*HZ) > fpu_swa_count = 0; > if ((fpu_swa_count < 4) && !(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) { > last_time = jiffies; > ++fpu_swa_count; > printk(KERN_WARNING "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n", > current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr); > } > > kernel says that you have them too frequently, which probably > impairs efficiency. It's a hint to programmer. > -- > vda > > - 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/