On 08/09/2013 02:39 AM, Han Pingtian wrote:
> On Thu, Jul 25, 2013 at 08:34:41AM -0600, Jens Axboe wrote:
>> On 07/24/2013 12:21 AM, Han Pingtian wrote:
>>> I think I have found what's wrong. After 'make distclean' then 'make',
>>> the problem of segfault has gone. There were some object files
>>> compiled on another machine. The recompilation fixed it. But looks like
>>> the ATBU call dosen't work on power7 system.
>>
>> So the recompilation fixed the segfault, but not the illegal instruction
>> due to ATBU?
>
> Yes. If we set unlimit core dump, fio will generate a core with
> backtrace like this one:
>
> #0 mfspr (envp=<value optimized out>) at arch/arch-ppc.h:55
> 55 asm volatile("mfspr %0,%1": "=r" (val) : "K" (reg));
> Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.107.el6.ppc64 libaio-0.3.107-10.el6.ppc64
> (gdb) bt
> #0 mfspr (envp=<value optimized out>) at arch/arch-ppc.h:55
> #1 get_cpu_clock (envp=<value optimized out>) at arch/arch-ppc.h:71
> #2 atb_child (envp=<value optimized out>) at arch/arch-ppc.h:88
> #3 atb_clocktest (envp=<value optimized out>) at arch/arch-ppc.h:98
> #4 arch_init (envp=<value optimized out>) at arch/arch-ppc.h:116
> #5 initialize_fio (envp=<value optimized out>) at libfio.c:248
> #6 0x0000000010067294 in main (argc=<value optimized out>, argv=<value optimized out>,
> envp=<value optimized out>) at fio.c:33
>
>
> Apologize for late to reply.
Alright, I'll have PPC default to the normal clock until we can improve
and detect this properly.
--
Jens Axboe
--
To unsubscribe from this list: send the line "unsubscribe fio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
