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Date: Mon, 15 Jul 2002 14:01:40 -0600
From: yodaiken@fsmlabs.com
To: mbs <mbs@mc.com>
Cc: Linus Torvalds <torvalds@transmeta.com>, Robert Love <rml@tech9.net>,
       linux-kernel@vger.kernel.org
Subject: Re: HZ, preferably as small as possible
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In-Reply-To: <200207151950.PAA11566@mc.com>; from mbs@mc.com on Mon, Jul 15, 2002 at 03:52:37PM -0400
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On Mon, Jul 15, 2002 at 03:52:37PM -0400, mbs wrote:
> On Monday 15 July 2002 14:56, Linus Torvalds wrote:
> > (*) Which is a lot less than the hw can generate, since you mustn't allow
> > users to bog down the system in timer interrupts by just using
> > "itimer(ITIMER_REAL, .. fine-resolution..)".
> 
> actually, that is an interesting philosophical argument.
> 
> in an embedded system, it is sometimes more useful to not put artificial 

That's why we have RTLinux.

> in an embedded system a "tickless" system is sometimes preferable to a ticked 
> system.  there is often only one or a very small number of processes/threads 
> running and the extra overhead of 10 surplus clock ticks per process quantum 
> is a waste of cycles. (also when using a ppc or similar modern chip(flame 
> on;-), there is no need to keep a software wall clock, as the cpu has a 64bit 
> free running counter)  

Right: but "one or a very small number of processes/threads" does not apply to 
Linux.



-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
 www.fsmlabs.com  www.rtlinux.com

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