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Re: [jsun@mvista.com: Re: [RFC] FPU context switch]

To: "Kevin D. Kissell" <kevink@mips.com>
Subject: Re: [jsun@mvista.com: Re: [RFC] FPU context switch]
From: Jun Sun <jsun@mvista.com>
Date: Tue, 17 Sep 2002 17:14:34 -0700
Cc: linux-mips@linux-mips.org, jsun@mvista.com
In-reply-to: <01b801c25ea7$ce074ed0$10eca8c0@grendel>; from kevink@mips.com on Wed, Sep 18, 2002 at 02:10:17AM +0200
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20020917160425.O17321@mvista.com> <01b801c25ea7$ce074ed0$10eca8c0@grendel>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.2.5i
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

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