Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756686AbZGCMdO (ORCPT ); Fri, 3 Jul 2009 08:33:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754445AbZGCMdA (ORCPT ); Fri, 3 Jul 2009 08:33:00 -0400 Received: from mail-fx0-f218.google.com ([209.85.220.218]:42833 "EHLO mail-fx0-f218.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753669AbZGCMc7 (ORCPT ); Fri, 3 Jul 2009 08:32:59 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=veWTqouWY7sNxVCgkq2PTblfbLzyDHwioO9Uv2zTftsm1hhSLcHOUtMFRubMvo2tKU d1Pw+YMj5YMnRIAZqrwF5Ck54hYN/QZGrCZ+xJfJFJs8eOsiyfkqVsBYccX2ifLJMa68 bHuXVU9mIIs6LgQmhTU1qpF7VduWus7msMrKc= MIME-Version: 1.0 Date: Fri, 3 Jul 2009 15:33:01 +0300 Message-ID: <5d96567b0907030533r5db79f9bi709f50d270706867@mail.gmail.com> Subject: RE: [PATCH] scheduler: introduce SCHED_RESET_ON_FORK scheduling policy flag, Second try From: Raz To: mzxreary@0pointer.de Cc: Linux Kernel Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 839 Lines: 19 Lennart Hello I had the same problem several years ago, but in the servers arena. in order to solve it I partitioned the solution to two: 1. UNI processors machines 2. SMP processors machines In UNI processor I created a RT kthread that polls over RTC device. The observed jitter was 400us. in SMP processors machine we created a new type of scheduling , called offline. what i did it to offload a processor and assign it task. jitter is 250us under heavy load. solution is open source and can be found at : http://sos-linux.svn.sourceforge.net/viewvc/sos-linux/offsched/Documentation/ Raz -- 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/