On 2021-01-28 07:28:35 (+0100), Ahmed S. Darwish wrote: > On Sat, Jan 23, 2021 at 12:59:29PM +0100, David Runge wrote: > ... > Can you please send the full kernel log, with boot parameter > "firewire_ohci.debug=-1", for mainline v5.4.91 vs. v5.4.91-rt50? kernel log for mainline: https://pkgbuild.com/~dvzrv/bugs/2021/01/linux-5.4.91-kernel.log kernel log for rt (no dice :-/): https://pkgbuild.com/~dvzrv/bugs/2021/01/linux-5.4.91.50.arch1-kernel.log > Please also make sure to use the exact same defconfig for both, except > with CONFIG_PREEMPT_RT=y for the -rt kenrel of course. config diff: https://pkgbuild.com/~dvzrv/bugs/2021/01/linux-5.4.91-lts_changed_vs_rt-lts.patch > This will help in comparing apples to apples, as you were posting the > results of different base kernels (vs. the -rt versions), and different > defconfigs (vs. -rt) within such kernels. The configuration for the 5.4.91 stock kernel has not been updated since the 5.4.83, which is maybe a bit misleading. Generally I enable anything that I can in the config for the realtime kernel. However, some settings of course get switched off, as they are not compatible. The diff above is for a custom version I just made, just to make sure and clear things out. > Good luck, Thanks, seems it's needed! > P.S. Since this maybe is a timing issue, and ohci bus reset handling > occurs at SCHED_OTHER workqueu context, were you by any chance running > unreasonably-intensive realtime workloads by the time the driver was > loaded? Not that I am aware of. The driver neither initializes the device during boot nor when later reloading. There are no intense services running. The system is fairly multi-purpose, so most things are started on demand. Thanks! David -- https://sleepmap.de
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