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NixOS Takes Action After 1.2GB/s ZFS Encryption Speed Drops To 200MB/s With Linux 5.0+

Submitted by Roy Schestowitz on Saturday 11th of May 2019 07:25:29 PM Filed under
GNU
Linux

The change in Linux 5.0 that initially broke ZFS On Linux compatibility ends up being pretty nasty for the ZFS encryption performance... A NixOS developer reports that the functions no longer exported by Linux 5.0+ and previously used by ZoL for AVX/AES-NI support end up dropping the ZFS data-set encryption performance to 200MB/s where as pre-5.0 kernels ran around 1.2GB/s.

This was the problem early on during the Linux 5.0 kernel cycle with the __kernel_fpu_ begin/restore functions no longer being exported. Even with the Linux 5.2 kernel merge window going on right now, a solution to satisfy the ZFS On Linux usage hasn't been achieved. Their used workaround by ZFS On Linux disables the vector-based (SSE/AVX) algorithms when building against Linux 5.0+. That in turn is what causes the big performance drop when running on the recent kernels.

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