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[0/1] Fix energy calcultation in RAPL MSR

Message ID 20240807124320.1741124-1-aharivel@redhat.com
Headers show
Series Fix energy calcultation in RAPL MSR | expand

Message

Anthony Harivel Aug. 7, 2024, 12:43 p.m. UTC 
Hi Paolo,

The value reported by the calculation was looking very wrong to me.

This should fix it for good.

Calculated value appears now way more accurate from what is expected 
from the feature:

with "-smp 4":

[...]
# modprobe intel_rapl_msr.ko
intel_rapl_common: Found RAPL domain package
intel_rapl_common: found 1 domains on package-0
intel_rapl_common: Core CPU package-0:package energy=61035pJ, time=976us, power=125000uW
intel_rapl_common: update package-0 domain package data
# 
# 
# 
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
303160
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
325621
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
325621
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
357237
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
357237
# cat /sys/class/powercap/intel-rapl:0/energy_uj 
388792
[...]

Tested with several SMP architecture.
(i.e -smp 4 / -smp 8,sockets=2,dies=1 / -smp 8,sockets=4,dies=2 )

Anthony Harivel (1):
  target/i386: Fix arguments for vmsr_read_thread_stat()

 target/i386/kvm/kvm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)