On Fri, 2015-11-06 at 11:15 -0800, Adrian Chadd wrote: > Ideally there'd be both behaviours: > > * You'd specify whether a timer/sleep needs to be exact or can > withstand some jitter (which is what linux provides); and > * You can communicate to the kernel its aggressiveness for coalescing > wakeups. >
We already implement exactly both of these things (the former in args to scheduling callouts, the latter in the form of the sysctl I referenced earlier which lets you set the "agressivness for coalescing"). The problem with the former is very little code actually uses the flavor of callout scheduling that lets you specify precision. The problem with the latter is that its default value is to allow enough deviation that people think the system is misbehaving. -- Ian _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
