Re: 2.4.21 on Itanium2: floating-point assist fault at ip 400000000062ada1, isr 0000020000000008

From: Denis Vlasenko (vda_at_port.imtp.ilyichevsk.odessa.ua)
Date: 03/31/04

  • Next message: Denis Vlasenko: "Re: rmmod uhci-hcd hangs eternally (linux-2.6.5-rc2-bk8)" 
    To: ulrich.windl@rz.uni-regensburg.de, linux-kernel@vger.kernel.org
Date:	Wed, 31 Mar 2004 19:00:17 +0200

    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
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