From owner-freebsd-current Fri May 15 03:52:55 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id DAA27691 for freebsd-current-outgoing; Fri, 15 May 1998 03:52:55 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from ns1.yes.no (ns1.yes.no [195.119.24.10]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id DAA27685 for ; Fri, 15 May 1998 03:52:52 -0700 (PDT) (envelope-from eivind@bitbox.follo.net) Received: from bitbox.follo.net (bitbox.follo.net [195.204.143.218]) by ns1.yes.no (8.8.7/8.8.7) with ESMTP id KAA02476; Fri, 15 May 1998 10:52:53 GMT Received: (from eivind@localhost) by bitbox.follo.net (8.8.8/8.8.6) id MAA24169; Fri, 15 May 1998 12:52:52 +0200 (MET DST) Message-ID: <19980515125252.54648@follo.net> Date: Fri, 15 May 1998 12:52:52 +0200 From: Eivind Eklund To: "Daniel O'Connor" Cc: current@FreeBSD.ORG Subject: Re: People having problems with X windows? References: <19980515180916.J1953@freebie.lemis.com> <199805150902.SAA24178@cain.gsoft.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.89.1i In-Reply-To: <199805150902.SAA24178@cain.gsoft.com.au>; from Daniel O'Connor on Fri, May 15, 1998 at 06:32:57PM +0930 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, May 15, 1998 at 06:32:57PM +0930, Daniel O'Connor wrote: > > > > The code is still in there, but I guess there is the need for more > > > research into the issue. > > > > Excuse my ignorance, but what's WC in this context? > > It means Write-Combining, which you can enable on Pentium Pro and Pentium II > machine... It makes things Go Faster(tm) but I;m not sure what it does.. (ie > can someone please explain :) (Part of this is extrapolation and all of it is based on things I don't remember as well as I should. Take with a grain of salt.) It caches writes and do them as a single write, basically. This allow you to use e.g. burst modes, where an address is written into a RAM address line and then a series of RAM cells are written using an auto-increment mode for the address. The problems occur when you have control registers for an external device (e.g, a display adapter) - these don't tend to like being written this way. Eivind. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message