Re: Newbies Question about Context Switches

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On Fri, Nov 16, 2001 at 03:25:43PM +0100, Fabrice Peix wrote:
> 	Just two questions :
> 
> 	1 : The time to do a  Context Switches is or not constent ?

Depends on the architecture. The Intel x86 family has a physical mapped
cache, so context switches don't affect the cache. The ARM family has a
virtual mapped cache, so each time a context switch occurs the cache
has to be flushed and invalidated. How much time that takes depends on
the amount of dirty cache lines.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Faculty
of Information Technology and Systems, Delft University of Technology,
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Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
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