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From: Jun Sun <jsun@mvista.com>
To: "Kevin D. Kissell" <kevink@mips.com>
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Subject: Re: [jsun@mvista.com: Re: [RFC] FPU context switch]
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In-Reply-To: <01b801c25ea7$ce074ed0$10eca8c0@grendel>; from kevink@mips.com on Wed, Sep 18, 2002 at 02:10:17AM +0200
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On Wed, Sep 18, 2002 at 02:10:17AM +0200, Kevin D. Kissell wrote:
> Are you able to test this stuff on a proper SMP
> system, by the way?  The efficiency of the code 
> that manipulates interprocessor control variables 
> can reasonably be expected to drop off a bit
> in a system with MP cache invalidations blasting
> left and right. 
>

Yes.  I understand this effect.  Solution 1), 2) 
and 3) don't really suffer from this problem because
variables tested & manipulated are local - unless the 
process migrates which is a different problem.

Jun