Example for access to performance counters?

[vsoch]

I have a Lima setup intended for eBPF, but I stopped when I didn't see see any hardware counters:

# perf list hw

List of pre-defined events (to be used in -e):

I'm not sure if this is a special flag / setting needed to my yaml, or I just chose the wrong base image. Any help would be appreciated! I'm using this setup. https://github.com/converged-computing/flux-lima/tree/main/ebpf

The basics seem to work, but I think I need this additional permission to test some of the go ebpf examples. Thank you!

[vsoch]

Ah! Liz Rice has an example!

https://raw.githubusercontent.com/lizrice/learning-ebpf/main/learning-ebpf.yaml

I will try this and report back.

[vsoch]

Actually this looks to be the same one I started from, albeit many months ago. 😢 I'll start fresh anyway in case something is different.

[afbjorklund]

Not sure what you were expecting?

anders@lima-default:/home/anders$ sudo apt install linux-tools-generic
...
anders@lima-default:/home/anders$ perf list hw

List of pre-defined events (to be used in -e or -M):

anders@lima-default:/home/anders$ sudo perf list hw

List of pre-defined events (to be used in -e or -M):

  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  ref-cycles                                         [Hardware event]

And I don't think using perf requires bpf*...

---

* Only for bpf-output, as far as I know?

https://www.brendangregg.com/perf.html#eBPF

[afbjorklund]

This is awesome: https://github.com/lizrice/learning-ebpf 💚 for when you don't have root (or sudo)

I've also provided a Lima config file with the packages you need for building the code pre-installed.

[vsoch]

I think that was probably just my mistake to not use sudo, thanks for the tips @afbjorklund.

[afbjorklund]

There is a subtle # ,
as opposed to $ prompt.