Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932794AbWLNOXw (ORCPT ); Thu, 14 Dec 2006 09:23:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932795AbWLNOXw (ORCPT ); Thu, 14 Dec 2006 09:23:52 -0500 Received: from web59212.mail.re1.yahoo.com ([66.196.101.38]:42114 "HELO web59212.mail.re1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S932794AbWLNOXr (ORCPT ); Thu, 14 Dec 2006 09:23:47 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=CvZ4nP9BsUbuILflr2qM3kM/Lelz2EVJ2wE/a3QDWDJ7gEFR88QmcKrzW7FO1O7Hrn05vzHbRuXsRWjys632JaCgNLhCl7Yu+BfqgOjgWXdXAs3osl27kocGzB1XM8f9dBEGWJT2e7d+szAIr93ocmAHO0PaY6i8Y81M4stAjrw=; X-YMail-OSG: 2yCS._cVM1lEPhGQaIE.q1WWI1yhI5etQRk3O0bx Date: Thu, 14 Dec 2006 06:23:43 -0800 (PST) From: tike64 Subject: Re: realtime-preempt and arm To: Steven Rostedt Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Thomas Gleixner In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Message-ID: <813680.16966.qm@web59212.mail.re1.yahoo.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1139 Lines: 35 Steven Rostedt wrote: > ... > it's ok for the timer to be a little over, but it must never be a > little under. > ... > So we make sure the timer goes off in (n+1) ms, and not just (n). Ok, this makes sense - thanks. What confuses / confused me is that I have 4 combinations: without-rt/with-rt X select/nanosleep; I first tried the without-rt/select combination and right after that with-rt combinations skipping the without-rt/nanosleep case. The first one was the one (the only one) which gives me the 10ms average delay. And after your explanations that fact bugs me even more. But that is a side issue. The real problem is now: how do I get rid of the multi-ms jitter? -- tike ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com - 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/