Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 6 Apr 2001 13:49:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 6 Apr 2001 13:48:58 -0400 Received: from delta.ds2.pg.gda.pl ([213.192.72.1]:53230 "EHLO delta.ds2.pg.gda.pl") by vger.kernel.org with ESMTP id ; Fri, 6 Apr 2001 13:48:38 -0400 Date: Fri, 6 Apr 2001 19:27:24 +0200 (MET DST) From: "Maciej W. Rozycki" Reply-To: "Maciej W. Rozycki" To: "Eric W. Biederman" cc: Ivan Kokshaysky , Geert Uytterhoeven , James Simmons , Alan Cox , Linux Fbdev development list , Linux Kernel Mailing List Subject: Re: [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?] In-Reply-To: Message-ID: Organization: Technical University of Gdansk MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 6 Apr 2001, Eric W. Biederman wrote: > I recall on the ev6 all memory accesses to locations with bit 40 set > are always to IO space are never cached and are never write buffered. If that is the case then EV6 is seriously flawed. You normally have non-cached locations buffered (since you don't always need peripheral device accesses to be posted immediately) and can force a writeback with a memory barrier. I don't have my 21264 handbook handy, so I can't check EV6 details at the moment, especially why it is different. -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/