(weak) benchmarks

[Greg Troxel <gdt%lexort.com@localhost>]

I often hear that xen is slow, pv is slow, and various other things, so
I'm trying to measure instead of entering lore in to the howto.  If you
have real data, especially if it's better or better organized than this,
or if you want to suggest the benchmark from pkgsrc that I should have
run instead, please do!

My test is simply "make package clean" in devel/m4 (from 2024Q2),
without ccache, and with WRKDIR on tmpfs /tmp.  The dom0 has disk images
in zfs.  This is run 4 times but you can see they are all close.  Memory
sizes vary, but I do not believe any of these are running out of RAM
during these tests.

This is a pre-2010 "Q6600" processor, that does have VMX.  A 2010
"E5700" without VMX appeared similar.

The dom0 is normal pv.
The i386 domUs are pvh/pvshim.
The amd64 are pv.

It remains to try for domUs
  pvh
  hvm
and for dom0
  pvh
to see how that is, both functionally and speed.   pvh/hvm domUs did not
work with the E5700.

** baremetal amd64 10 8GB 2024Q2

       81.82 real        55.51 user        24.08 sys
       81.46 real        56.09 user        23.67 sys
       81.43 real        55.28 user        24.47 sys
       81.47 real        55.41 user        24.37 sys

** dom0 4GB 2024Q2

      161.38 real        71.82 user        84.81 sys
      160.98 real        72.16 user        84.75 sys
      161.11 real        71.21 user        85.85 sys
      161.15 real        72.44 user        84.63 sys

** domU i386 9 1GB 2024Q2

      225.29 real       114.57 user       102.74 sys
      231.95 real       119.89 user       105.01 sys
      233.48 real       121.01 user       105.18 sys
      230.41 real       118.90 user       104.48 sys

** domU amd64 9 3GB 2024Q2

      195.93 real        82.20 user       106.28 sys
      195.34 real        81.62 user       107.12 sys
      195.67 real        80.88 user       108.17 sys
      195.36 real        82.74 user       106.34 sys

** domU i386 10 1GB 2024Q2

      221.40 real       116.13 user        98.72 sys
      226.58 real       120.22 user       100.78 sys
      225.94 real       118.69 user       101.83 sys
      226.57 real       119.32 user       101.71 sys

** domU amd64 10 3GB 2024Q2

      207.45 real        86.78 user       118.86 sys
      206.47 real        86.58 user       119.16 sys
      206.80 real        86.81 user       119.18 sys
      206.67 real        86.94 user       118.73 sys