Access to Intel(r) Performance Counter Monitor has denied (no MSR or PCI CFG space access).

[Shuja-ur-Rehman_B_]

Hi

I m getting following output when I ran pcm-memory.x command on Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz  with linux (open-suse) os.

 Intel(r) Performance Counter Monitor: Memory Bandwidth Monitoring Utility V2.10 (2015-11-17 09:01:38 +0100 ID=cd66c34)

 Copyright (c) 2009-2015 Intel Corporation
 This utility measures memory bandwidth per channel or per DIMM rank in real-time

Number of physical cores: 4
Number of logical cores: 8
Number of online logical cores: 8
Threads (logical cores) per physical core: 2
Num sockets: 1
Physical cores per socket: 4
Core PMU (perfmon) version: 3
Number of core PMU generic (programmable) counters: 4
Width of generic (programmable) counters: 48 bits
Number of core PMU fixed counters: 3
Width of fixed counters: 48 bits
Nominal core frequency: 2700000000 Hz
Package thermal spec power: 45 Watt; Package minimum power: 36 Watt; Package maximum power: 0 Watt;
Access to Intel(r) Performance Counter Monitor has denied (no MSR or PCI CFG space access).
Cleaning up

and following output when i ran pcm.x

Intel(r) Performance Counter Monitor V2.10 (2015-11-17 09:01:38 +0100 ID=cd66c34)

 Copyright (c) 2009-2015 Intel Corporation

Number of physical cores: 4
Number of logical cores: 8
Number of online logical cores: 8
Threads (logical cores) per physical core: 2
Num sockets: 1
Physical cores per socket: 4
Core PMU (perfmon) version: 3
Number of core PMU generic (programmable) counters: 4
Width of generic (programmable) counters: 48 bits
Number of core PMU fixed counters: 3
Width of fixed counters: 48 bits
Nominal core frequency: 2700000000 Hz
Package thermal spec power: 45 Watt; Package minimum power: 36 Watt; Package maximum power: 0 Watt;
Trying to use Linux perf events...
Linux Perf: Error on programming generic event #0 error: Invalid argument
Access to Intel(r) Performance Counter Monitor has denied (Unknown error).
Cleaning up

Can anybody let me know the issue(s).

Thanks

Shuja

[Carlos_P_]

Hi,

Well, for the access to the MSR driver, I needed to set the permissions to allow the read access with "sudo modprobe msr".
I don't know if that solution uses the perf_event but, anyway, you can change the /proc/sys/kernel/perf_event_paranoid value to less than 1. It's needed for the perf_event_open() support.

Regards