From owner-cvs-sys  Fri Apr 19 01:18:30 1996
Return-Path: owner-cvs-sys
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id BAA07958
          for cvs-sys-outgoing; Fri, 19 Apr 1996 01:18:30 -0700 (PDT)
Received: from tfs.com (tfs.com [140.145.250.1])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id BAA07942
          Fri, 19 Apr 1996 01:18:19 -0700 (PDT)
Received: from critter.tfs.com by tfs.com (smail3.1.28.1) with SMTP
	id m0uABOU-0003z9C; Fri, 19 Apr 96 01:18 PDT
Received: from localhost.tfs.com (localhost.tfs.com [127.0.0.1]) by critter.tfs.com (8.6.12/8.6.12) with SMTP id IAA29611; Fri, 19 Apr 1996 08:18:13 GMT
X-Authentication-Warning: critter.tfs.com: Host localhost.tfs.com didn't use HELO protocol
To: Bruce Evans <bde@zeta.org.au>
cc: davidg@Root.COM, CVS-committers@freefall.freebsd.org,
        cvs-all@freefall.freebsd.org, cvs-sys@freefall.freebsd.org,
        phk@freefall.freebsd.org
Subject: Re: cvs commit: src/sys/i386/i386 swtch.s vm_machdep.c src/sys/i386/include pcb.h src/sys/i386/isa wd.c 
In-reply-to: Your message of "Fri, 19 Apr 1996 18:05:41 +1000."
             <199604190805.SAA08335@godzilla.zeta.org.au> 
Date: Fri, 19 Apr 1996 08:17:57 +0000
Message-ID: <29609.829901877@critter.tfs.com>
From: Poul-Henning Kamp <phk@critter.tfs.com>
Sender: owner-cvs-sys@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> >We save about 6 clock cycles in cpu_switch but not caring about %eax :-)
> 
> It should save only 1 cycle on a 486 and 0.5 or 1 cycles on a Pentium :-).
> Even if the value has to be loaded from memory, it should be in a cache

Remeber that you will have to save it as well...

No matter how many, you would have wasted those cycles anyway..
--
Poul-Henning Kamp           | phk@FreeBSD.ORG       FreeBSD Core-team.
http://www.freebsd.org/~phk | phk@login.dknet.dk    Private mailbox.
whois: [PHK]                | phk@ref.tfs.com       TRW Financial Systems, Inc.
Future will arrive by its own means, progress not so.