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Re: [CPROG] En ordentlig timing



"Morten Olsen" <sslug@sslug> skrev:

> In article <sslug@sslug>, "Anders Melchiorsen"
> <sslug@sslug> wrote:
> 
> > Peter Aagaard Kristensen <sslug@sslug> skrev den 02-Nov-01:
> > 
> >>  >Selv kernen laver busy wait hvis den skal vente i millisekunder.
> >> 
> >> Hvilke tidsfunktion bruger den til at måle det med ??
> > 
> > Ikke noget, du kan bruge fra user space.
> 
> Det kan man nu sagtens "rdtsc" er ikke en priviligeret instruktion:

Nåja; jeg mente at man ikke havde adgang til kernens delay-funktioner.
Man kan selvfølgelig lave det samme selv, som før omtalt.


> Det hjælper vel ikke rigtig noget med at lave gettimeofday()
> systemkald når vi snakker om forsinkelser i 100nsec området.

Det er vi vist alle enige om; jeg skrev i hvert fald tidligere "ikke
til de tidsintervaller".


Jeg undskylder mine uklarheder.

Anders.


 
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