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Questions tagged [cpu]

The CPU (Central Processing Unit), is the chip in the computer that actually performs the operations and calculations that are done as a program runs. It is essentially what executes a program.

11 votes
1 answer
1k views

How to do AMD CPU microcode update (not BIOS update)?

Yesterday, I updated my UEFI/BIOS to the latest version (about 11 days old only). Summary of my HW/OS: # hostnamectl | grep -v ' ID' Static hostname: rog-g713pi Pretty hostname: ASUS ROG Strix G17 ...
Vlastimil Burián's user avatar
3 votes
5 answers
933 views

Determine which are P-cores/E-cores (Intel CPU)

I have a Intel Core Ultra 5 135U processor with heterogenous cores (performance, power-efficient and low power efficient). How do I check which processor is which? I tried to see /proc/cpuinfo, but ...
Kuchara's user avatar
  • 187
5 votes
1 answer
476 views

Unable to Access CPU Model Name in Debian VMWare

I am currently doing my HW using Debian 13 in VMWare fusion pro. I am trying to retrieve information of CPU model name (eg. Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz) I have tried lscpu and cat /proc/...
b1841837's user avatar
2 votes
1 answer
35 views

Probing Hardware for Sensor Data with High Frequency (Temperature and CPU clock frequency)

I'm trying to learn how to probe my CPU sensor data. I need at most 1 to 2 ms sampling period. Using hwmon this could be possible for the temperature data. But so far I only discovered the CPUfreq ...
Bastian sek's user avatar
0 votes
2 answers
162 views

Hot weather help! [closed]

I live in my car and it gets HOT in the summer. I've noticed when the temperature rises above normal room temperatures (like ~72f) my laptop proportionally starts to slow down to the point its ...
spanish-math's user avatar
1 vote
1 answer
212 views

How to measure actual CPU utilization in Linux for multi core applications?

I have a computation intensive process that I need to run multiple times on a multi-core processor but "top" isn't showing utilization or load in a useful way. For example, imagine my task ...
tkw954's user avatar
  • 113
0 votes
1 answer
128 views

Unable to Mitigate GDS (gather_data_sampling) using Fedora 41, 40 Intel HP

I was using Fedora 40 and upgraded the system to Fedora 41 still getting this from my cpu information $ cat /sys/devices/system/cpu/vulnerabilities/gather_data_sampling Vulnerable: No microcode The ...
Foss Developer's user avatar
19 votes
1 answer
2k views

CPU number not equal to threads per core X cores per socket X sockets

As far as I understand, the number of CPUs in my computer should be given by CPU = Thread(s) per core x Core(s) per socket x Socket(s) Here are the first few lines of the lscpu output: $ lscpu | head -...
Miguel's user avatar
  • 193
0 votes
1 answer
634 views

Difference between RSI and RDI registers and what they do in syscalls

So I searched stack exchange, seeing this question as well (here: https://stackoverflow.com/questions/23367624/intel-64-rsi-and-rdi-registers) and is said: These registers were originally implicitly ...
Anonymous's user avatar
2 votes
1 answer
1k views

Why does Windows 11 work in Qemu with CPU type qemu64?

I am not sure whether this question is more related to Linux or to Windows. However, here we go: Using qemu-system-x86_64 7.2.15 on Debian bookworm with kernel 6.1.0 / amd64 on a server with two Xeon ...
Binarus's user avatar
  • 3,931
0 votes
2 answers
71 views

Files in /dev/cpuset renamed?

I'm working on some old scripts that deal with cpusets, porting to openSUSE. The scripts worked fine with openSUSE 15.5, but now with 15.6 they fail because the /dev/cpuset files they expect aren't ...
Daniel Griscom's user avatar
1 vote
0 answers
97 views

Alternate way to get the CPU cache size

I have a project where I need to get the size of the cache on my Linux machine. I don't know the linux distro, and the /etc/os-release file does not exist. I only know the kernel and architecture: ...
Plat00n's user avatar
  • 111
0 votes
1 answer
71 views

How to find out the reason of gpe10 CPU spikes every ~10 seconds

I would like to find out the reason for CPU spikes on my laptop. I've narrowed it down to /sys/firmware/acpi/interrupts/gpe10, but am not sure how to proceed further. Here is what the spikes looks ...
ZiiMakc's user avatar
  • 103
2 votes
1 answer
3k views

ASUS motherboard fan control under Linux

I built a machine using an ASUS TUF GAMING B650M-PLUS motherboard and a Ryzen 7 8700G CPU. Linux installed with no problems, but I am missing fan control and monitoring. Under Windows, I use ASUS ...
Renan's user avatar
  • 17.4k
0 votes
0 answers
233 views

Clarifications on perf_events data collection

Originally posted here on stackoverflow I have never used the perf command before (but I need it), hence I have been reading the (really useful) PerfWiki. The section devoted to Event-based sampling ...
Sirion's user avatar
  • 101

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