Re: unable to get load latency info

[Manuel Selva <selva.manuel@gmail.com>]

You must also take care of the fact that PEBS load Latency Measurement 
has been introduced in kernel 3.10

http://web.eece.maine.edu/~vweaver/projects/perf_events/features.html
http://comments.gmane.org/gmane.linux.kernel/1428651

Manu

On 02/28/2014 07:24 AM, Muthusamy wrote:
> Hi,
>
> I am trying to get the memory load latency info using perf, but I am always getting 0.
> Can you please help me in understanding what I am missing. Below are the details
>
> [root@rafa tmp]# ./perf --version
> perf version 3.12.11
> [root@rafa tmp]# ./perf stat -e r100b pwd  ### (I have tried with other data intensive programs too)
> /tmp/cms/tmp
>
>   Performance counter stats for 'pwd':
>
>                   0 r100b
>
>         0.000846849 seconds time elapsed
>
> [root@rafa tmp]# uname -a
> Linux rafa 2.6.32-431.el6.x86_64 #1 SMP Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
>
> [root@rafa tmp]# cat /proc/cpuinfo
> processor: 0
> vendor_id: GenuineIntel
> cpu family: 6
> model: 26
> model name: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
> stepping
> : 5
> cpu MHz: 1600.000
> cache size: 8192 KB
> physical id: 0
> siblings: 1
> core id: 0
> cpu cores: 1
> apicid: 0
> initial apicid: 0
> fpu: yes
> fpu_exception: yes
> cpuid level: 11
> wp: yes
> flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
> bogomips: 5333.09
> clflush size: 64
> cache_alignment: 64
> address sizes: 40 bits physical, 48 bits virtual
> power management:
>
> processor: 1
> vendor_id
> : GenuineIntel
> cpu family: 6
> model: 26
> model name: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
> stepping: 5
> cpu MHz: 1600.000
> cache size: 8192 KB
> physical id
> : 1
> siblings: 1
> core id: 0
> cpu cores: 1
> apicid: 16
> initial apicid: 16
> fpu: yes
> fpu_exception: yes
> cpuid level: 11
> wp: yes
> flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
> bogomips: 5332.56
> clflush size: 64
> cache_alignment: 64
> address sizes: 40 bits physical, 48 bits virtual
> power management:
>
> [root@rafa tmp]#
>
> Let me know if any other details are also required and steps on how to get them.
>
> Thanks,
> Muthusamy C
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