** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1813847
Title:
af-alg stressor triggers modprobe throttling
Status in Stress-ng:
In Progress
Status in linux package in Ubuntu:
New
Bug description:
Due to the combination of high core counts and perhaps a lack of
available hash/crypto hardware acceleration drivers, arm64 server
platforms generate a lot of noisy modprobe throttling messages when
running the af-alg stressor. This appears to be partially mitigated in
master by disabling hashes/ciphers once they are found to be not
present. But, w/ 96 cores/hogs, we presumably still hit the kernel
with 96 * (nr_hashes + nr_ciphers) before that mitigation takes
effect, and that is sufficient to cause the kernel to emit throttling
messages.
$ sudo dmesg -c > /dev/null ; ./stress-ng --af-alg 0 --af-alg-ops=200000;
sudo dmesg -c
stress-ng: info: [76141] defaulting to a 86400 second (1 day, 0.00 secs) run
per stressor
stress-ng: info: [76141] dispatching hogs: 96 af-alg
stress-ng: info: [76141] successful run completed in 0.40s
[ 5808.489046] __request_module: 25 callbacks suppressed
[ 5808.489050] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.489503] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.489724] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.489731] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.490092] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-xor-all, throttling...
[ 5808.490235] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash-all, throttling...
[ 5808.490308] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.490367] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
[ 5808.490597] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module crypto-ghash, throttling...
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