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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2039576
Title:
Enabling CONFIG_CRYPTO_STATS causes significant fscrypt performance
degradation
Status in linux package in Ubuntu:
Incomplete
Bug description:
CONFIG_CRYPTO_STATS is enabled in Jammy 5.15.0-xx as well as 6.2.0-xx
kernel by default.
# uname -r
5.15.0-69-generic
root@r100:~# grep CONFIG_CRYPTO_STATS /boot/config-5.15.0-69-generic
CONFIG_CRYPTO_STATS=y
However, that CONFIG_CRYPTO_STATS makes big negative performance impacts.
Lustre (http://www.lustre.com Open source parallel filesystem) supports
client encryption based on fscrypt.
I ran some benchmarks of Lustre client encryption on Lustre client with
Ubuntu 6.2.0-34-generic kernel below.
1 x client(2 x Gold 6438Y+, 512GB RAM, 2 x HDR200)
Ubuntu22.04 (6.2.0-34-generic)
# fio -name=iotest-w -ioengine=sync -rw=write -blocksize=16m
-iodepth=1 -direct=1 -fallocate=none -size=200g -numjobs=128
-group_reporting -directory=/lustre/encrypted -create_serialize=0
-fiename_format='f.$jobnum.$filenum' -scramble_buffers=0 -runtime=60
6.2.0-34-generic, no encryption 48.5GB/s
6.2.0-34-generic, encryption 21.7GB/s
6.2.0-34-generic-noCryptStats, encryption 48.2GB/s
When Lustre client encryption enabled, there were 65% performance
degradations compared to non encryption's performance. (21.7GB/s vs 48.5GB/s)
I also tested on 6.2.0-34-generic-noCryptStats which I built custom
6.2.0-34-generic kernel with disabling CONFIG_CRYPTO_STATS.
The result was pretty good. The performance did boost and it was almost same
speed against non encryption case. (48.2GB/s vs 48.5GB/s)
I also found same fscrypt performance problem reported in Ceph with RHEL
kernel below.
https://lists.ceph.io/hyperkitty/list/[email protected]/thread/44GMO5UGOXDZKFSOQMCPPHYTREUEA3ZI/
Eventually, Redhat disabled CONFIG_CRYPTO_STATS in latest RHEL9 kernel
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2947
Kernel config option CONFIG_CRYPTO_STATS should be disabled until it is
enhanced (BZ#2231850) - https://access.redhat.com/errata/RHSA-2023:5069
I would disable CONFIG_CRYPTO_STATS in all Jammy kernels until proper
fixes and new solution is available in upstream kernel.
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