Date: Thu, 31 Jul 2003 08:11:13 +0200
From: Jan-Benedict Glaw <jbglaw@lug-owl.de>
To: linux-kernel@vger.kernel.org
Subject: Re: TSCs are a no-no on i386
Message-ID: <20030731061113.GL1873@lug-owl.de>
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References: <20030730135623.GA1873@lug-owl.de> <20030730181006.GB21734@fs.tum.de> <20030730183033.GA970@matchmail.com> <20030730184529.GE21734@fs.tum.de> <1059595260.10447.6.camel@dhcp22.swansea.linux.org.uk> <20030730203318.GH1873@lug-owl.de> <20030730221925.GA2858@werewolf.able.es>
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On Thu, 2003-07-31 00:19:25 +0200, J.A. Magallon <jamagallon@able.es>
wrote in message <20030730221925.GA2858@werewolf.able.es>:
> On 07.30, Jan-Benedict Glaw wrote:
> [...]
> > ...and IFF those new opcodes bring _that_ much performance, then we
> > should think about another Debian distribution for i686-linux. Up to
> > now, I was really proud of having _one_ distribution that's basically
> > capable of running on all and any machines I own...
>=20
> Do as Mandrake (and I suppose another distros), and put optimized librari=
es
> in /lib/i686, /lib/mmx, /lib/sse, /usr/lib/i686, etc. New ld.so supports
> mapping different versions of library depending on arch.

I know. ...and this won't work. Think about this:

	- Some lib links (statically) some parts of libstdc++5.a. This
	  is done on a i386.
	- Some app (compiled for i486 on some other box) links against
	  the above lib (which was copied over).

Now, you've got two ways to access your atomic variables. Do that
multithreaded, and you'll boom.

It's all about "eventually" and "possibly", but you break binary
compatibility at some point.

MfG, JBG

--=20
   Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
   "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur | Gegen Krieg
    fuer einen Freien Staat voll Freier B=FCrger" | im Internet! |   im Ira=
k!
      ret =3D do_actions((curr | FREE_SPEECH) & ~(IRAQ_WAR_2 | DRM | TCPA));

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