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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1977699
Title:
zfs icp has deselected all optimized aes & gcm impls
Status in linux package in Ubuntu:
Incomplete
Status in zfs-linux package in Ubuntu:
Confirmed
Bug description:
In an upgrade from Jammy kernel 5.15.0-27-generic to 5.15.0-35-generic
on x86_64 (AMD threadripper pro 39x5wx series), a 40x performance
regression in the first read of cached writes to an encrypted dataset
revealed that zfs is no longer configured to choose any
implementations from advanced instruction sets:
$ grep . /sys/module/icp/parameters/*impl*
/sys/module/icp/parameters/icp_aes_impl:cycle [fastest] generic x86_64
/sys/module/icp/parameters/icp_gcm_impl:cycle [fastest] generic
With correct configuration, the output should read as follows:
$ grep . /sys/module/icp/parameters/*impl*
/sys/module/icp/parameters/icp_aes_impl:cycle [fastest] generic x86_64 aesni
/sys/module/icp/parameters/icp_gcm_impl:cycle [fastest] avx generic pclmulqdq
The immediate ill effects are the use of gcm_generic_mul instead of
the dedicated instruction, consuming 50% CPU and slowing reads of data
cached in ram to less than 20% of what they would be even reading
directly from disk.
openzfs changed its configure process to detect cpu features
differently recently to adapt to the kernel api change. It seems that
the upstream changes that unexport the needed symbols and the
downstream changes in openzfs that stop using them were not
cherrypicked in sync.
https://github.com/openzfs/zfs/pull/13147
https://github.com/openzfs/zfs/pull/13236
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