Messages in this thread | | | From | "Ulrich Windl" <> | Date | Thu, 01 Apr 2004 09:04:08 +0200 | Subject | Re: 2.4.21 on Itanium2: floating-point assist fault at ip 400000000062ada1, isr 0000020000000008 |
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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 <ab_CompManyEq+384> 0x400000000062ad70 <ab_CompManyEq+592>: [MII] nop.m 0x0 0x400000000062ad71 <ab_CompManyEq+593>: zxt4 r14=r44;; 0x400000000062ad72 <ab_CompManyEq+594>: add r15=r35,r14 0x400000000062ad80 <ab_CompManyEq+608>: [MMI] add r14=r34,r14;; 0x400000000062ad81 <ab_CompManyEq+609>: ldfd f7=[r14] 0x400000000062ad82 <ab_CompManyEq+610>: nop.i 0x0 0x400000000062ad90 <ab_CompManyEq+624>: [MMI] ldfd f6=[r15];; 0x400000000062ad91 <ab_CompManyEq+625>: nop.m 0x0 0x400000000062ad92 <ab_CompManyEq+626>: nop.i 0x0 0x400000000062ada0 <ab_CompManyEq+640>: [MFI] nop.m 0x0 0x400000000062ada1 <ab_CompManyEq+641>: fcmp.eq.s0 p7,p6=f7,f6 <<< 0x400000000062ada2 <ab_CompManyEq+642>: nop.i 0x0;; 0x400000000062adb0 <ab_CompManyEq+656>: [MIB] nop.m 0x0 0x400000000062adb1 <ab_CompManyEq+657>: 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 > >
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