On Mon Sep 13 10, Alexander Motin wrote: > [snip] > > There is set of tunables, also available as writable sysctls, allowing to > control wanted event timer subsystem behavior: > kern.eventtimer.timer - allows to choose event timer hardware to use. > On x86 there is up to 4 different kinds of timers. Depending on whether > chosen timer is per-CPU, behavior of other options slightly differs. > kern.eventtimer.periodic - allows to choose periodic and one-shot > operation mode. In periodic mode, current timer hardware taken as the only > source of time for time events. This mode is quite alike to previous kernel > behavior. One-shot mode instead uses currently selected time counter > hardware to schedule all needed events one by one and program timer to > generate interrupt exactly in specified time. Default value depends of > chosen timer capabilities, but one-shot mode is preferred, until other is > forced by user or hardware. > kern.eventtimer.singlemul - in periodic mode specifies how much times > higher timer frequency should be, to not strictly alias hardclock() and > statclock() events. Default values are 2 and 4, but could be reduced to 1 > if extra interrupts are unwanted. > kern.eventtimer.idletick - makes each CPU to receive every timer interrupt > independently of whether they busy or not. By default this options is > disabled. If chosen timer is per-CPU and runs in periodic mode, this option > has no effect - all interrupts are generating. > > [snip]
great! :) would it be possible to document these tunables in a new manual or add them to an existing one? sorry if i missed this and they are already documented somewhere. -- a13x _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
