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⇱ FreeBSD 15.0 vs. Ubuntu Linux For AMD EPYC Server Performance - Phoronix

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FreeBSD 15.0 vs. Ubuntu Linux For AMD EPYC Server Performance

Written by Michael Larabel in Operating Systems on 10 December 2025 at 10:30 AM EST. Page 2 of 5. 50 Comments.

The BlogBench workload for replicating a busy file server saw the read performance of FreeBSD 15.0 on OpenZFS perform similarly to the Ubuntu releases on EXT4.

But FreeBSD 15 fell behind Ubuntu on its default EXT4 file-system when it came to the write workloads with FreeBSD defaulting to OpenZFS.

For a variety of operating system primitive benchmarks, Ubuntu Linux tended to win in most of the benchmarks with the exception of FreeBSD 15.0 having much faster thread creation as well as much speedier memory allocations.

With the SMHasher crypto benchmarks, FreeBSD 15.0 did perform very well for the SHA3-256 performance while with the other hashing algorithms the performance was similar between the two platforms. FreeBSD continues to use LLVM Clang by default and the SHA3-256 standout performance on FreeBSD may be due to a compiler optimization benefiting that particular piece of code.