Comment 16 for bug 1838575

As assumed this really seems to be cross arch and for all sizes.
Here 16 PU, 128G on ppc64el:
  #1: 54 seconds
  #2: 7 seconds
  #3: 23 seconds

Upped to 192GB this has:
  #1: 75 seconds
  #2: 5 seconds
  #3: 23 seconds

As a note, in this case I checked there are ~7 seconds before it does into this "single thread, kernel busy" load. Those 7 seconds might be other/usual init in qemu/kvm while the long load is the

Just the linear scaling is what breaks it, in case the same speed applies 10 times as much +1.28TB would be in the 10 minutes as well. The remaining difference might be dimm speed and bandwidth.