Description After heavy disk loads (copying large files, dd urandom data to a disk) especially USB3.0 attached. OpenBSD 6.6-current stutters every 1-3s even after copying is completed till next reboot. Disk was encrypted by bioctl with -r64 option. It looks like system wide disk I/O problem, maybe USB related.
How to reproduce Connect external HDD and dd if=/dev/urandom of=/dev/rsd0c bs=1M or copy large file with some (possible heavy) CPU load by any background process. During the urandom writing or copying a large file procedure 6.6-current stutters. It stutters anyway even all copy operations ended, until reboot. From user's side it looks as missed symbols during typing, any realtime traffic like VoIP RTP interrupts every stutter. Some tests detail have been described here: https://marc.info/?l=openbsd-misc&m=158403485529894&w=2 dmesg of affected machine has been sent to [email protected] Martin
