From owner-freebsd-arch  Fri Jan 25 16:15:57 2002
Delivered-To: freebsd-arch@freebsd.org
Received: from gull.prod.itd.earthlink.net (gull.mail.pas.earthlink.net [207.217.120.84])
	by hub.freebsd.org (Postfix) with ESMTP id F335737B402
	for <arch@freebsd.org>; Fri, 25 Jan 2002 16:15:54 -0800 (PST)
Received: from pool0218.cvx21-bradley.dialup.earthlink.net ([209.179.192.218] helo=mindspring.com)
	by gull.prod.itd.earthlink.net with esmtp (Exim 3.33 #1)
	id 16UGVb-0006ng-00; Fri, 25 Jan 2002 16:15:51 -0800
Message-ID: <3C51F532.87ADF4A5@mindspring.com>
Date: Fri, 25 Jan 2002 16:15:46 -0800
From: Terry Lambert <tlambert2@mindspring.com>
X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony}  (Win98; U)
X-Accept-Language: en
MIME-Version: 1.0
To: Nate Williams <nate@yogotech.com>,
	Daniel Eischen <eischen@pcnet1.pcnet.com>,
	Dan Eischen <eischen@vigrid.com>, k Macy <kip_macy@yahoo.com>,
	Peter Wemm <peter@wemm.org>, Julian Elischer <julian@vicor-nb.com>,
	arch@FreeBSD.ORG
Subject: Re: KSE question
References: <3C51D0B6.F6E04EBC@mindspring.com>
			<Pine.SUN.3.91.1020125164325.24428A-100000@pcnet1.pcnet.com>
			<15441.56832.170618.611705@caddis.yogotech.com>
			<3C51E888.FD13A18D@mindspring.com>
			<15441.59691.361172.394760@caddis.yogotech.com>
			<3C51F18A.C0D8D6B1@mindspring.com> <15441.62092.864056.841853@caddis.yogotech.com> <3C51F492.CB0FB69E@mindspring.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-arch@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-arch.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-arch>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-arch>
X-Loop: FreeBSD.ORG

Replying to myself...

Terry Lambert wrote:
> Unfortunately, we can't fix the base problem, which is
> "delayed exception signalling on x86 FPUs sucks".  8-).
> 
> I think the only thing we can do is guarantee correctness.
> 
> Right now, I'm just trying to avoid dragging everyone down
> with the FPU using code, which I think, *has* to drag down,
> at this point.  8-(.

It occurs to me that if we could limit the FPU using code
to the model where there is one KSE per user space thread,
then we get what Linux threads has now, and can do lazy
binding.

Obviously, there's a performance penalty to that approach,
as well, but I think we are going to have to pay the piper
one way or the other, if we use the FPU.

-- Terry

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message