OK, so lets close this and perhaps can you file a bug against powertop
instead?
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Title:
powertat -R erroneously reports no RAPL domains
To manag
Yes. Sorry to have you reading the manuals on the weekend!
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Title:
powertat -R erroneously reports no RAPL domains
To manage notifications about
OK, so the bug seems to be bogus reporting by powertop rather than
powerstat.
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Title:
powertat -R erroneously reports no RAPL domains
To manage
perhaps relevantly, here is the strace of powertop trying to read the
msr.
24773 write(1, "RAPL device for cpu 0\n", 22) = 22
24773 access("/dev/cpu/0/msr", R_OK)= 0
24773 open("/dev/cpu/0/msr", O_RDONLY) = 4
24773 pread(4, 0x7ffd966dbb08, 8, 1553) = -1 EIO (Input/output error)
24773 close(4)
john@fogey:~$ sudo rdmsr 0x611
rdmsr: CPU 0 cannot read MSR 0x0611
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Title:
powertat -R erroneously reports no RAPL domains
To manage notific
And the MSR 0x611 MSR_PKG_ENERGY_STATUS was only introduced in
Sandybridge according to "Table 35-12. MSRs Supported by Intel®
Processors based on Intel® microarchitecture code name Sandy Bridge" of
the Intel® 64 and IA-32 Architectures Software Developer’s Manual.
I therefore believe powertop may
What does the following do:
sudo modprobe msr
sudo rdmsr 0x611
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Title:
powertat -R erroneously reports no RAPL domains
To manage notifications
RAPL was introduced on Sandybridge, so Arrandale does not support this,
so perhaps powertop is incorrect. Powertop just reads MSR 0x611using:
ret = read_msr(first_cpu, MSR_PKG_ENERY_STATUS, &value);
if (ret > 0) {
rapl_domains |= PKG_DOMAIN_PRESENT;
I'm using 3.19.0-22-generic. I don't have a
/sys/devices/virtual/powercap/. /sys/class/powercap exists but is empty.
$ grep CPU /proc/cpuinfo
model name : Intel(R) Core(TM) i7 CPU M 620 @ 2.67GHz
model name : Intel(R) Core(TM) i7 CPU M 620 @ 2.67GHz
model name : Intel
It seems that the RAPL kernel driver only supports the following CPUs:
RAPL_CPU(0x2a, rapl_defaults_core),/* Sandy Bridge */
RAPL_CPU(0x2d, rapl_defaults_core),/* Sandy Bridge EP */
RAPL_CPU(0x37, rapl_defaults_atom),/* Valleyview */
RAPL_CPU(0x3a, rapl_defaults_cor
Just to clarify, I currently believe this is a bug in the kernel driver,
so I think once you CPU is enabled in the driver it will show up in
powerstat.
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** Changed in: powerstat (Ubuntu)
Status: In Progress => Incomplete
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Title:
powertat -R erroneously reports no RAPL domains
To manage not
Which kernel are you using?
Can you tar up the following:
tar cvf - /sys/devices/virtual/powercap/ > powercap.tar
and let me know if /sys/class/powercap exists on your machine.
Finally, which CPU do you have?
cat /proc/cpuinfo | grep CPU
Thanks!
** Changed in: powerstat (Ubuntu)
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