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Date:      Fri, 7 Apr 2000 12:10:56 -0400 
From:      "Yevmenkin, Maksim N, CSCIO" <myevmenkin@att.com>
To:        "'Gustavo V G C Rios'" <kernel@tdnet.com.br>
Cc:        "'freebsd-hackers@freebsd.org'" <freebsd-hackers@freebsd.org>
Subject:   RE: Is traditional unixes kernel really stable ?
Message-ID:  <E598F159668DD311B9C700902799EAF44733C5@njb140po01.ems.att.com>

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[...]

> > only one :-) performance :-) context switch is a slow operation.
> > 
> Excuse me gentleman, who said that ?

Well, Intel does :)

> Take time to visit this site: 
> http://www.qnx.com/iat/download/index.html

I know this OS. It looks great. Perhaps, it is a good choice for embeded OS.
A good OS design could help to reduce context switch overhead. 
Just to give you some examples of context switching overhead, 
please take a look at 

http://www.atnf.csiro.au/~rgooch/benchmarks/linux-scheduler.html

Thanks,
emax


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