Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

Lee Revell
2005-07-14T14:56:47Z

On Thu, 2005-07-14 at 10:38 +0200, Ingo Molnar wrote:
> - there are real-time applications (robotic environments: fast rotating
> tools, media and mobile/phone applications, etc.) that want 10
> usecs precision. If such users increased HZ to 100,000 or even
> 1000,000, the current timer implementation would start to creek: e.g.
> jiffies on 32-bit systems would wrap around in 11 hours or 1.1 hours.
> (To solve this cleanly, pretty much the only solution seems to be to
> increase the timeout to a 64 bit value. A non-issue for 64-bit
> systems, that's why i think we could eventually look at this
> possibility, once all the other problems are hashed out.)
>

Those types of systems will not be 64 bit for many, many years, if
ever...

Lee