From owner-freebsd-realtime@FreeBSD.ORG Fri Oct 31 04:14:10 2008 Return-Path: Delivered-To: freebsd-realtime@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B3A591065672 for ; Fri, 31 Oct 2008 04:14:10 +0000 (UTC) (envelope-from xiazhongqi@huawei.com) Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [119.145.14.67]) by mx1.freebsd.org (Postfix) with ESMTP id 743688FC08 for ; Fri, 31 Oct 2008 04:14:10 +0000 (UTC) (envelope-from xiazhongqi@huawei.com) Received: from huawei.com (szxga04-in [172.24.2.12]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0K9L00JF34MU57@szxga04-in.huawei.com> for freebsd-realtime@freebsd.org; Fri, 31 Oct 2008 12:04:06 +0800 (CST) Received: from huawei.com ([172.24.1.12]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0K9L00AQU4MUDC@szxga04-in.huawei.com> for freebsd-realtime@freebsd.org; Fri, 31 Oct 2008 12:04:06 +0800 (CST) Received: from x49105 ([10.111.9.47]) by szxml05-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0K9L00LVW4MTB1@szxml05-in.huawei.com> for freebsd-realtime@freebsd.org; Fri, 31 Oct 2008 12:04:06 +0800 (CST) Date: Fri, 31 Oct 2008 12:04:05 +0800 From: Sam Xia In-reply-to: <20081030120020.838891065756@hub.freebsd.org> To: freebsd-realtime@freebsd.org Message-id: <000201c93b0d$b7b5fa20$2f096f0a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 X-Mailer: Microsoft Office Outlook 11 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Thread-index: Ack6hx2y1kc6vLmCRpqWGwpYRVqZJAAhbMRQ X-Mailman-Approved-At: Fri, 31 Oct 2008 11:14:16 +0000 Subject: which timing mechanism is more accurate? X-BeenThere: freebsd-realtime@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Realtime extensions per POSIX 1003.4" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 31 Oct 2008 04:14:10 -0000 hi all, Someone had every told me that select-based timing mechanism is more accurate that signal based mechanism. Anyone could give me some tips about the underlying reasons? Best Regards, Sam Xia