Top all-time · #20479
Bartosz Fenski
Personal blog · bartosz.fenski.plsystemsdata
Bartosz Fenski writes fEnIo's personal website..., a personal blog at bartosz.fenski.pl about systems and data. Since 2026, 3 different Hacker News readers have linked it 7 times, most often “Btrfs/ZFS/bcachefs under workloads classic benchmarks skip”. The last post was in 2020, but the archive is still widely read.
Too few sampled comments (1) to say how often HN recommends it.?
Why HN links it
HN readers link this blog for its benchmark of modern filesystems on a single disc. One commenter cites it for the finding that performance differences between filesystems are only about 10%.
Summarised by Claude from a sample of 1 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Bartosz Fenski's personal website
Most-linked posts?
- Btrfs/ZFS/bcachefs under workloads classic benchmarks skip2 people · 2 mentions · first linked 2026-08-05
What Hacker News says?
First hybrid tier run: https://bartosz.fenski.pl/modern-fs-benchmark/sas-hdd/hybrid... It is FIRST run... I will probably start tuning it now. And I'm open for suggestions what and how to tune ;)
Comment linking /modern-fs-benchmark/sas-hdd/hybrid-tier/
on “Btrfs/ZFS/bcachefs under workloads classic benchmarks skip”Submitted Btrfs/ZFS/bcachefs under workloads classic benchmarks skip as a story · 179 points
HN discussionFor the main linked benchmark there are no dedicated test hypervisors. It's all based on GH runners with all the limitations and quirks that came with it. Real hardware is used in: https://bartosz.fenski.pl/modern-fs-benchmark/real-hw/ https://bartosz.fenski.pl/modern-fs-benchmark/sas-hdd/ But unfortunatelly it's much more limited number of actual runs. sas-hdd is still in progress so numbers for it should increase…
Comment linking /modern-fs-benchmark/sas-hdd/
on “Btrfs/ZFS/bcachefs under workloads classic benchmarks skip”The author of the benchmark here. I went over some comments and I'll try to tackle them here. I'm pretty clear that GH runner based benchmark is far from perfect due to noisy neighbours etc. Thus every test first is running so called calibration... to reject completely unreliable VMs. I'm fully aware that this can't completely fix the issue. Can limit it but not fix. But as of now there are 593 runs recorded so aver…
Comment linking /modern-fs-benchmark/sas-hdd/
on “Btrfs/ZFS/bcachefs under workloads classic benchmarks skip”Its interesting that performance diff between FSs on top of single disc is only around 10%: https://bartosz.fenski.pl/modern-fs-benchmark/ I expected zfs and btrfs to have way higher overhead
Comment linking /modern-fs-benchmark/
on “Modern-Fs-Benchmark”