On Tue 25 Aug 2020 09:47:24 PM CEST, Brian Foster <bfoster@xxxxxxxxxx> wrote: > My fio fallocates the entire file by default with this command. Is that > the intent of this particular test? I added --fallocate=none to my test > runs to incorporate the allocation cost in the I/Os. That wasn't intentional, you're right, it should use --fallocate=none (I don't see a big difference in my test anyway). >> The Linux version is 4.19.132-1 from Debian. > > Thanks. I don't have LUKS in the mix on my box, but I was running on a > more recent kernel (Fedora 5.7.15-100). I threw v4.19 on the box and > saw a bit more of a delta between XFS (~14k iops) and ext4 (~24k). The > same test shows ~17k iops for XFS and ~19k iops for ext4 on v5.7. If I > increase the size of the LVM volume from 126G to >1TB, ext4 runs at > roughly the same rate and XFS closes the gap to around ~19k iops as > well. I'm not sure what might have changed since v4.19, but care to > see if this is still an issue on a more recent kernel? Ok, I gave 5.7.10-1 a try but I still get similar numbers. Perhaps with a larger filesystem there would be a difference? I don't know. Berto
