Re: Current ULE state and plans (was Re: HMP scheduling on FreeBSD)
Date: Mon, 19 Jan 2026 14:59:10 UTC
On Monday, January 19th, 2026 at 9:30 AM, George Mitchell <george+freebsd@m5p.com> wrote: > > > On 1/19/26 09:17, Olivier Certner wrote: > > > Hi, > > > > This is a mail intended to spread the news. I must also admit to getting a bit tired to see the same misconceptions and falsities on ULE, and even on schedulers in general, repeated over long periods of time by several people. > > [...] > > One of my personal goals is to deprecate 4BSD in 16 if possible, as it is more and more irrelevant on modern machines and seems too lightly tested. > > > [...] > > Thanks for this explanation and progress report. > > Rather than deprecating 4BSD, has anyone thought about making it a load > time tunable, perhaps even a loadable kernel module? Or, in the world > of packages for base, having the scheduler be its own package? > Especially if someone wants to write yet another scheduler? -- George That would be something similar to sched-ext on Linux except it is kernel module not eBPF. It's worth considering but cleaning up scheduler interface should be done first.