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Re: [RFC] FPU context switch

To: Greg Lindahl <>
Subject: Re: [RFC] FPU context switch
From: Jun Sun <>
Date: Tue, 17 Sep 2002 11:35:16 -0700
In-reply-to: <>; from on Tue, Sep 17, 2002 at 11:31:36AM -0700
Original-recipient: rfc822;
References: <> <>
User-agent: Mutt/1.2.5i
On Tue, Sep 17, 2002 at 11:31:36AM -0700, Greg Lindahl wrote:
> On Tue, Sep 17, 2002 at 11:04:23AM -0700, Jun Sun wrote:
> > Currently I am leaning towards 2) or 3).  What is your opinion?
> (1) and (2) are how other archs like Alpha and Itanium deal with
> this. I think (3) is likely to be painful to debug 

The good news is that I have already got it implemented and it
survived fairly stressful FPU tests.  :-)

> and maintain and
> won't win much. So I'd suggest (2).

Yes, 3) is a little harder to maitain.  I don't have much clue
as how much it will improve the performance in reality.
Presumably if there is only one FPU intensive process in the
system, it can improve a little bit.

Thanks for the feedback.


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