From: kernel test robot <oliver.sang@intel.com>
To: Eric Biggers <ebiggers@kernel.org>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
Ard Biesheuvel <ardb@kernel.org>, <linux-crypto@vger.kernel.org>,
<oliver.sang@intel.com>
Subject: [linus:master] [lib/crypto] e5046823f8: stress-ng.urandom.ops_per_sec 4.3% regression
Date: Wed, 15 Apr 2026 16:45:48 +0800 [thread overview]
Message-ID: <202604151657.8e26ef70-lkp@intel.com> (raw)
Hello,
kernel test robot noticed a 4.3% regression of stress-ng.urandom.ops_per_sec on:
commit: e5046823f8fa3677341b541a25af2fcb99a5b1e0 ("lib/crypto: chacha: Zeroize permuted_state before it leaves scope")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[still regression on linus/master e774d5f1bc27a85f858bce7688509e866f8e8a4e]
[still regression on linux-next/master 66672af7a095d89f082c5327f3b15bc2f93d558e]
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: urandom
cpufreq_governor: performance
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202604151657.8e26ef70-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260415/202604151657.8e26ef70-lkp@intel.com
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-icl-2sp8/urandom/stress-ng/60s
commit:
v7.0-rc5
e5046823f8 ("lib/crypto: chacha: Zeroize permuted_state before it leaves scope")
v7.0-rc5 e5046823f8fa3677341b541a25a
---------------- ---------------------------
%stddev %change %stddev
\ | \
92086428 -4.3% 88086482 stress-ng.time.minor_page_faults
1869 -5.2% 1773 stress-ng.urandom.million_random_bits_per_sec
94288 -4.3% 90188 stress-ng.urandom.million_random_bits_read
92078928 -4.3% 88078900 stress-ng.urandom.ops
1534939 -4.3% 1468337 stress-ng.urandom.ops_per_sec
1.198e+08 ± 2% +14.2% 1.368e+08 ± 12% cpuidle..time
177224 -1.8% 173977 vmstat.system.in
1.87 ± 29% +1.3 3.14 mpstat.cpu.all.idle%
0.43 ± 2% -0.0 0.41 ± 2% mpstat.cpu.all.soft%
2.99 ± 2% +0.4 3.40 ± 11% turbostat.C1%
2.86 ± 2% +14.3% 3.26 ± 12% turbostat.CPU%c1
2.114e+10 -4.4% 2.021e+10 perf-stat.i.branch-instructions
0.34 +0.0 0.35 perf-stat.i.branch-miss-rate%
68731688 -3.1% 66627770 perf-stat.i.cache-references
0.62 +4.1% 0.65 perf-stat.i.cpi
3.538e+11 -4.2% 3.39e+11 perf-stat.i.instructions
1.61 -4.0% 1.54 perf-stat.i.ipc
70.83 -4.4% 67.69 perf-stat.i.metric.K/sec
1510879 -4.4% 1443951 perf-stat.i.minor-faults
3020690 -4.4% 2886892 perf-stat.i.page-faults
0.30 +0.0 0.30 perf-stat.overall.branch-miss-rate%
0.62 +4.1% 0.65 perf-stat.overall.cpi
1.61 -4.0% 1.54 perf-stat.overall.ipc
2.081e+10 -4.4% 1.99e+10 perf-stat.ps.branch-instructions
68408155 -3.2% 66202291 perf-stat.ps.cache-references
3.483e+11 -4.2% 3.337e+11 perf-stat.ps.instructions
1487270 -4.4% 1421509 perf-stat.ps.minor-faults
2973479 -4.4% 2842012 perf-stat.ps.page-faults
2.135e+13 -3.8% 2.053e+13 perf-stat.total.instructions
57.02 -2.9 54.15 perf-profile.calltrace.cycles-pp.chacha_permute.chacha_block_generic.get_random_bytes_user.vfs_read.ksys_read
13.65 -0.5 13.12 perf-profile.calltrace.cycles-pp._copy_to_iter.get_random_bytes_user.vfs_read.ksys_read.do_syscall_64
4.78 -0.1 4.65 perf-profile.calltrace.cycles-pp.__mmap
4.25 -0.1 4.13 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
4.30 -0.1 4.17 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mmap
5.35 -0.1 5.26 perf-profile.calltrace.cycles-pp.__munmap
5.11 -0.1 5.02 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__munmap
5.08 -0.1 5.00 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
5.01 -0.1 4.92 perf-profile.calltrace.cycles-pp.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
4.82 -0.1 4.73 perf-profile.calltrace.cycles-pp.do_vmi_align_munmap.do_vmi_munmap.__vm_munmap.__x64_sys_munmap.do_syscall_64
4.93 -0.1 4.84 perf-profile.calltrace.cycles-pp.do_vmi_munmap.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe
5.02 -0.1 4.93 perf-profile.calltrace.cycles-pp.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
3.06 -0.1 2.98 perf-profile.calltrace.cycles-pp.__mprotect
2.75 -0.1 2.68 perf-profile.calltrace.cycles-pp.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
2.84 -0.1 2.77 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
2.86 -0.1 2.79 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mprotect
2.77 -0.1 2.70 perf-profile.calltrace.cycles-pp.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
2.15 -0.1 2.08 perf-profile.calltrace.cycles-pp.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.33 -0.0 1.28 perf-profile.calltrace.cycles-pp.unmapped_area_topdown.vm_unmapped_area.arch_get_unmapped_area_topdown.__get_unmapped_area.do_mmap
1.14 -0.0 1.10 perf-profile.calltrace.cycles-pp.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
1.28 -0.0 1.24 perf-profile.calltrace.cycles-pp.vma_modify.vma_modify_flags.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect
1.33 -0.0 1.29 perf-profile.calltrace.cycles-pp.vma_modify_flags.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
1.04 -0.0 1.00 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
1.35 -0.0 1.31 perf-profile.calltrace.cycles-pp.vm_unmapped_area.arch_get_unmapped_area_topdown.__get_unmapped_area.do_mmap.vm_mmap_pgoff
1.12 -0.0 1.09 perf-profile.calltrace.cycles-pp.__split_vma.vma_modify.vma_modify_flags.mprotect_fixup.do_mprotect_pkey
0.83 -0.0 0.80 perf-profile.calltrace.cycles-pp.__get_unmapped_area.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64
0.78 -0.0 0.76 perf-profile.calltrace.cycles-pp.arch_get_unmapped_area_topdown.__get_unmapped_area.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff
1.37 -0.0 1.35 perf-profile.calltrace.cycles-pp.chacha_permute.chacha_block_generic.crng_fast_key_erasure.crng_make_state.get_random_bytes_user
0.59 -0.0 0.57 perf-profile.calltrace.cycles-pp.__x64_sys_pselect6.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.82 +0.1 1.88 perf-profile.calltrace.cycles-pp.crng_make_state.get_random_bytes_user.vfs_read.ksys_read.do_syscall_64
1.73 +0.1 1.79 perf-profile.calltrace.cycles-pp.crng_fast_key_erasure.crng_make_state.get_random_bytes_user.vfs_read.ksys_read
1.54 +0.1 1.60 perf-profile.calltrace.cycles-pp.chacha_block_generic.crng_fast_key_erasure.crng_make_state.get_random_bytes_user.vfs_read
83.26 +0.4 83.62 perf-profile.calltrace.cycles-pp.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
84.30 +0.4 84.66 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
84.21 +0.4 84.57 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
83.12 +0.4 83.48 perf-profile.calltrace.cycles-pp.vfs_read.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
82.09 +0.4 82.49 perf-profile.calltrace.cycles-pp.get_random_bytes_user.vfs_read.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
64.23 +0.9 65.16 perf-profile.calltrace.cycles-pp.chacha_block_generic.get_random_bytes_user.vfs_read.ksys_read.do_syscall_64
58.57 -2.9 55.67 perf-profile.children.cycles-pp.chacha_permute
15.25 -0.6 14.69 perf-profile.children.cycles-pp._copy_to_iter
4.91 -0.1 4.78 perf-profile.children.cycles-pp.__mmap
4.00 -0.1 3.89 perf-profile.children.cycles-pp.vm_mmap_pgoff
3.76 -0.1 3.66 perf-profile.children.cycles-pp.do_mmap
5.42 -0.1 5.32 perf-profile.children.cycles-pp.__munmap
5.02 -0.1 4.93 perf-profile.children.cycles-pp.__vm_munmap
5.02 -0.1 4.93 perf-profile.children.cycles-pp.__x64_sys_munmap
4.93 -0.1 4.84 perf-profile.children.cycles-pp.do_vmi_munmap
4.82 -0.1 4.73 perf-profile.children.cycles-pp.do_vmi_align_munmap
3.13 -0.1 3.05 perf-profile.children.cycles-pp.__mprotect
2.77 -0.1 2.70 perf-profile.children.cycles-pp.do_mprotect_pkey
2.78 -0.1 2.70 perf-profile.children.cycles-pp.__x64_sys_mprotect
2.16 -0.1 2.10 perf-profile.children.cycles-pp.mprotect_fixup
1.34 -0.0 1.30 perf-profile.children.cycles-pp.unmapped_area_topdown
1.50 -0.0 1.46 perf-profile.children.cycles-pp.arch_get_unmapped_area_topdown
1.59 -0.0 1.55 perf-profile.children.cycles-pp.__get_unmapped_area
1.15 -0.0 1.11 perf-profile.children.cycles-pp.ksys_mmap_pgoff
1.35 -0.0 1.32 perf-profile.children.cycles-pp.vm_unmapped_area
1.28 -0.0 1.25 perf-profile.children.cycles-pp.vma_modify
1.33 -0.0 1.30 perf-profile.children.cycles-pp.vma_modify_flags
1.14 -0.0 1.11 perf-profile.children.cycles-pp.__split_vma
0.82 ± 2% -0.0 0.80 perf-profile.children.cycles-pp.mas_empty_area_rev
1.06 -0.0 1.04 perf-profile.children.cycles-pp.mas_find
1.02 -0.0 1.00 perf-profile.children.cycles-pp.clear_bhb_loop
0.38 -0.0 0.36 ± 2% perf-profile.children.cycles-pp.__memcg_slab_post_alloc_hook
0.60 -0.0 0.58 perf-profile.children.cycles-pp.__x64_sys_pselect6
0.50 -0.0 0.48 perf-profile.children.cycles-pp.ioctl
0.63 -0.0 0.61 perf-profile.children.cycles-pp.mas_next_slot
0.07 -0.0 0.06 perf-profile.children.cycles-pp.vma_set_page_prot
1.83 +0.1 1.89 perf-profile.children.cycles-pp.crng_make_state
1.74 +0.1 1.80 perf-profile.children.cycles-pp.crng_fast_key_erasure
83.14 +0.4 83.50 perf-profile.children.cycles-pp.vfs_read
83.27 +0.4 83.64 perf-profile.children.cycles-pp.ksys_read
82.61 +0.4 82.99 perf-profile.children.cycles-pp.get_random_bytes_user
66.11 +1.0 67.10 perf-profile.children.cycles-pp.chacha_block_generic
57.97 -2.9 55.10 perf-profile.self.cycles-pp.chacha_permute
10.80 -0.5 10.27 perf-profile.self.cycles-pp._copy_to_iter
1.31 -0.1 1.26 perf-profile.self.cycles-pp.get_random_bytes_user
1.01 -0.0 0.98 perf-profile.self.cycles-pp.clear_bhb_loop
0.49 -0.0 0.47 perf-profile.self.cycles-pp.mas_rev_awalk
0.22 ± 2% -0.0 0.21 perf-profile.self.cycles-pp.__memcg_slab_post_alloc_hook
7.32 +3.9 11.18 perf-profile.self.cycles-pp.chacha_block_generic
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-04-15 8:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-15 8:45 kernel test robot [this message]
2026-04-15 17:47 ` [linus:master] [lib/crypto] e5046823f8: stress-ng.urandom.ops_per_sec 4.3% regression Eric Biggers
2026-04-16 0:45 ` Jason A. Donenfeld
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