From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262138AbVFUPoW (ORCPT ); Tue, 21 Jun 2005 11:44:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262133AbVFUPmH (ORCPT ); Tue, 21 Jun 2005 11:42:07 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:25243 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S262128AbVFUPky (ORCPT ); Tue, 21 Jun 2005 11:40:54 -0400 Subject: Re: IBM HDAPS Someone interested? From: Lee Revell To: Adam Goode Cc: Vojtech Pavlik , Pavel Machek , Alejandro Bonilla , linux-kernel@vger.kernel.org, linux-thinkpad@linux-thinkpad.org In-Reply-To: <1119303016.5194.24.camel@lynx.auton.cs.cmu.edu> References: <20050620155720.GA22535@ucw.cz> <005401c575b3_5f5bba90_600cc60a@amer.sykes.com> <20050620163456.GA24111@ucw.cz> <20050620165703.GB477@openzaurus.ucw.cz> <20050620204533.GA9520@ucw.cz> <1119303016.5194.24.camel@lynx.auton.cs.cmu.edu> Content-Type: text/plain Date: Tue, 21 Jun 2005 11:37:38 -0400 Message-Id: <1119368259.19357.18.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2005-06-20 at 17:30 -0400, Adam Goode wrote: > Freefall detection: 300 ms > Head park time: 300-500 ms > (from page 2 of document) > > Still doesn't seem too bad to figure out how to code though, at least > once we can figure out how to get the data stream! > > P.S. The main control system runs as a Windows kernel driver. Not as > safe as full hardware, but probably better than userspace. :) > Ugh, if userspace can't meet a 300ms RT constraint, that's a pretty shitty OS you have there. This should certainly be done in userspace on Linux. Lee