Why does XFS not have data block checksumming or compression simple. Something to wake up to iomap change in Linux kernel is a major one as this allows the VFS layer to put request straight to the block layer if the block map information from the file system is already got and in the iomap. You can put caching under XFS on Optane as well and see insane performance boosts. But not all workloads you need this integrity and replication like postgresql database with their WAL don't need ZFS send or file system integrity so IO performance is more important and their own backup system provides that stuff.Д«asically ZFS features that effect IO make it not the most suitable for particular workloads. That there is currently not a good replication for that. Having data integrity stuff does not come free. Its surprising to a lot of people how poor the L2ARC and ZIL in fact performs when you compare it to other cache options. Basically fair competition here if you have the solid state drive for cache you should compare all file systems setup to use it that way and the file system does not need to have cache feature to have a block level cache under it. Really ZFS without cache is not unfair in fact its giving ZFS a better chance than having to face off against XFS with cache. So yes the thing you complain about with normal file system benchmarks being unfair because they don't allow L2ARC you see those attempting to sell ZFS do the reverse where they don't give XFS or any other file system any of the other caching options. Only reason ZFS in benchmarks with L2ARC wins over XFS is those benchmarking are basically not giving XFS a cache. In fact the performance difference gets wider not narrower in XFS advantage. So ZFS with ZIL and L2ARC on does not catch up to XFS with Cache on. What is roughly the same boost you get by enabling L2ARC to ZFS expect you are starting off slower. There has been a recent change.Дo notice a warm cache under XFS works out to ~4x faster. Mirrors + cache options with xfs in perform do normally beat zfs with ZIL and L2ARC at least now. Yes dm-cache and bcache and other solutions like it really do speed up xfs a lot. This is what I call bias bench-marking you see ZFS with ZIL and L2ARC but then they don't give xfs one cache options either then claim win. ZFS loses in single HDD solutions to XFS as well.

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