Ext4 vs. Btrfs performance on Qubes OS installs

General Discussion
4

@fiftyfourthparallel thank you for pointing to that post. I can’t follow your conclusion however. The numbers I see are:

LVM-XFS LVM+XFS Btrfs+blake2b
boot (best) 22.3 s 22.8 s 20.5 s
boot (avg) 22.7 s 24.7 s 20.9 s
VM boot (best) 4.68 s 4.59 s 4.48 s
VM boot (avg) 5.14 s 4.82 s 4.78 s
cryptsetup 526.8 MiB/s 646.6 MiB/s 718.2 MiB/s [1]

Then there is the part about 4kn in case of “LVM+XFS” showing a consistent advantage of ~1 s in VM boot. However this measurement was only done with “LVM+XFS”.

  • Does this mean it’s only possible in that setup?
  • What about all the other “normal” results that show “Btrfs+blake2b” being faster?
  • Wouldn’t one assume that “Btrfs+blake2b” AND 4kn (if such a thing is possible) is even faster?

@51lieal?

Obviously I haven’t consumed all the linked threads yet, but I shall do so. This is fascinating.

  1. in this case two measurements were given: “directio”=718.2 MiB/s and “no directio”=646.6 MiB/s (same as LVM+XFS). ↩︎

1 Like