Messages in this thread | | | Date | Thu, 22 Apr 2004 12:56:25 +0200 | From | Arjan van de Ven <> | Subject | Re: [PATCH] s390 (9/9): no timer interrupts in idle. |
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On Thu, Apr 22, 2004 at 12:53:15PM +0200, Martin Schwidefsky wrote: > active in idle, a "0" indicates that the HZ timer is switchted off. > The semantic "the next tick is THIS many <ticks> from now" IHMO doesn't make > any sense. Skipping ticks will have some really bad effects, e.g. if the xtime > isn't up-to-date network packets will get incorrect time stamps, timer events > will be delivered too late, etc.
why? Most hardware have an alternative time source for such time stamps. Timer events *won't* be delivered too late, simply *because* the timer said "don't bother checking back for X amount of time", so when that time has expired (eg the delay) then the timer comparison tells the kernel "ok this one is due now". [unhandled content-type:application/pgp-signature] | |