FS#69160 - [linux] performance regression with 5.10.3
Attached to Project:
Arch Linux
Opened by linearithmik (linearithmik) - Friday, 01 January 2021, 00:07 GMT
Last edited by Andreas Radke (AndyRTR) - Wednesday, 21 April 2021, 11:19 GMT
Opened by linearithmik (linearithmik) - Friday, 01 January 2021, 00:07 GMT
Last edited by Andreas Radke (AndyRTR) - Wednesday, 21 April 2021, 11:19 GMT
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Details
Description: After upgrading from linux "5.9.14.arch1-1" to
"5.10.3.arch1-1", the ufw "0.36-5" commands and service
startup are about 10x slower.
Note that the file system used for root is ext4. Additional info: * The system is installed on a Samsung 970 EVO Plus SSD. If a spinning drive is used, the performance regression might not be observable. * There is also a one-time graphical glitch introduced with the new kernel when launching alacritty "0.6.0-1". But, it might need its own task. Steps to reproduce: 1. Install ufw "0.36-5" and enable its service ("ufw.service") 2. Reboot your system, run `systemd-analyze blame | grep ufw.service` and note the observed time 3. Downgrade the kernel to "5.9.14.arch1-1" 4. Repeat step "2." and compare the values Observed values: "5.9.14.arch1-1": around 150 ms "5.10.3.arch1-1": around 1.6 s Example of ufw commands: ``` sudo ufw --force reset sudo ufw default deny incoming sudo ufw default allow outgoing sudo ufw enable ``` Those commands could be put into a file and timed with `time sh file.sh` |
This task depends upon
Edit: Also present with 5.10.4 from testing
Edit2: Seems to affect the CPU, not the disk. The same Ardour-Session gives me 25% DSP load on 5.9.14, while it's >90% with 5.10.3/4
CPU is Intel(R) Core(TM) i5-4570