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Date: Fri, 14 Feb 2003 02:29:31 +0100
From: Andi Kleen <ak@suse.de>
To: Peter Tattam <peter@jazz-1.trumpet.com.au>
Cc: Andi Kleen <ak@suse.de>, "Eric W. Biederman" <ebiederm@xmission.com>,
       linux-kernel@vger.kernel.org, discuss@x86-64.org
Subject: Re: [discuss] Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
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References: <20030213180705.GB27560@wotan.suse.de> <Pine.BSF.3.96.1030214103845.369E-100000@jazz-1.trumpet.com.au>
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> I have a need to run v86 code from ring 0, so I'm not keen to slip other
...

[for the unsuspecting readers - Peter is talking about non Linux here]


> people's code in there.  This would mean I'd need to write a v86 emulator from
> scratch which I think is more time than writing the warping code that I've
> suggested.

Have you taken a look at valgrind? (http://developer.kde.org/~sewardj/)

It is a free software x86 JIT. I don't think it supports 16bit code currently,
but it probably wouldn't be too difficult to add. It wasn't primarily designed
for speed - its main application is to instrument programs - but its slowdown
compared to running on the real CPU is moderate and its certainly fast enough
for anything designed to run on DoS.

-Andi
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