Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750803AbVK0BED (ORCPT ); Sat, 26 Nov 2005 20:04:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750804AbVK0BEB (ORCPT ); Sat, 26 Nov 2005 20:04:01 -0500 Received: from mail-in-07.arcor-online.net ([151.189.21.47]:55693 "EHLO mail-in-07.arcor-online.net") by vger.kernel.org with ESMTP id S1750803AbVK0BEA (ORCPT ); Sat, 26 Nov 2005 20:04:00 -0500 From: Bodo Eggert Subject: Re: Paused I/O versus regular I/O To: Jean Delvare , LKML Reply-To: 7eggert@gmx.de Date: Sun, 27 Nov 2005 01:52:49 +0100 References: <5dato-1qR-9@gated-at.bofh.it> User-Agent: KNode/0.7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8Bit Message-Id: X-be10.7eggert.dyndns.org-MailScanner-Information: See www.mailscanner.info for information X-be10.7eggert.dyndns.org-MailScanner: Found to be clean X-be10.7eggert.dyndns.org-MailScanner-From: harvested.in.lkml@posting.7eggert.dyndns.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 888 Lines: 15 Jean Delvare wrote: > Could anyone tell me what the difference is between "paused" I/O > (inb_p, oub_p and friends) and regular I/O (inb, oub and friends)? I > understand that the former includes some delays here and there, but how > do I know when to use the paused variant, and when the non-paused > variant is OK? AFAIK, some old hardware needs it. The original ISA bus speed was 4.77 MHz, and AT changed it to 8 MHz. Some chips needed extra delays to compensate, and those chips stayed around for a long time. -- Ich danke GMX daf?r, die Verwendung meiner Adressen mittels per SPF verbreiteten L?gen zu sabotieren. - 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/