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[PATCH 0/1] Fix energy calcultation in RAPL MSR


From: Anthony Harivel
Subject: [PATCH 0/1] Fix energy calcultation in RAPL MSR
Date: Wed, 7 Aug 2024 14:43:19 +0200

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(-)

-- 
2.45.2




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