** Also affects: linux (Ubuntu) Importance: Undecided Status: New
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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... To manage notifications about this bug go to: https://bugs.launchpad.net/stress-ng/+bug/1813847/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp