From owner-freebsd-stable@FreeBSD.ORG Wed Jan 18 07:17:41 2012 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 63C9A1065672 for ; Wed, 18 Jan 2012 07:17:41 +0000 (UTC) (envelope-from martin@sugioarto.com) Received: from mailserv.regfish.com (mailserv.regfish.com [79.140.61.33]) by mx1.freebsd.org (Postfix) with ESMTP id A91BB8FC16 for ; Wed, 18 Jan 2012 07:17:40 +0000 (UTC) Received: (qmail 25565 invoked from network); 18 Jan 2012 06:50:58 -0000 Received: from pd9ec04e0.dip0.t-ipconnect.de (HELO yuni.sugioarto.com) (46959-0001@[217.236.4.224]) (envelope-sender ) by mailserv.regfish.com (qmail-ldap-1.03) with SMTP for ; 18 Jan 2012 06:50:58 -0000 Received: from zelda.sugioarto.com (zelda.sugioarto.com [192.168.0.12]) by yuni.sugioarto.com (Postfix) with ESMTP id A5F611BAC55; Wed, 18 Jan 2012 07:50:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=sugioarto.com; s=mail; t=1326869456; bh=amUAdPvnBAVSzPuxUDKaMsRl4TWmwWZm07quz8Y3zS4=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: Mime-Version:Content-Type; b=DzqmNUuj+bmzTa+AjmXiSxCO8VxTEjGCc7uLlj7tELKAOr27ffZyVJeZxJmBBroEb es9vTx7RtyiV0ULmeEg/4IOTN5EpmJM82XkCA2HvHaz//rSuO3C4LvxBgPa9VLZgi/ KfvaAaktVUtf5y8Bn7gGpQCWTPPzNld6uv6KP/Zs= Date: Wed, 18 Jan 2012 07:50:49 +0100 From: Martin Sugioarto To: Joe Holden Message-ID: <20120118075049.289954e8@zelda.sugioarto.com> In-Reply-To: <4F15D643.8000907@rewt.org.uk> References: <4F15D643.8000907@rewt.org.uk> X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.6; amd64-portbld-freebsd9.0) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/XN9bJXeKGZJLVqce.8vP9sB"; protocol="application/pgp-signature" Cc: FreeBSD Stable Mailing List Subject: Re: Timekeeping in stable/9 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Jan 2012 07:17:41 -0000 --Sig_/XN9bJXeKGZJLVqce.8vP9sB Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Am Tue, 17 Jan 2012 20:12:51 +0000 schrieb Joe Holden : > Hi guys, >=20 > Has anyone else noticed the tendency for 9.0-R to be unable to=20 > accurately keep time? I've got a couple of machines that have been=20 > upgraded from 8.2 that are struggling, in particular a Virtual box > guest that was fine on 8.2, but now that's its been upgraded to 9.0 > counts at anything from 2 to 20 seconds per 5 second sample, the > result is similar with HPET, ACPI-fast and TSC. Hi Joe, I can confirm this on VirtualBox. I've been running WinXP inside VirtualBox and measured network I/O during downloads. It showed me very high download rates (around 800kB/s) while it's physically possible to download 200kB/s through DSL here (Germany sucks with DSL, even in largest cities, btw!). I correlated this behavior with high disk I/O on the host. That means that the timer issues on the virtual host appear when I start a larger cp job on the host. I also immediately thought that this has something to do with timers. You can perhaps try yourself and confirm, if it's the disk I/O that influences timers. I somehow don't like the hard disk behavior. It makes desktop unusable in some situations (mouse pointer skipping, applications lock for several seconds). > I also have physical boxes which new seem to drift quite > substantially, ntpd cannot keep up and as these boxes need to be able > to report the time relatively accurately, it is causing problems with > log times and such... Not sure about physical boxes. I have not taken a look at this, yet. -- Martin --Sig_/XN9bJXeKGZJLVqce.8vP9sB Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iQIcBAEBAgAGBQJPFmvPAAoJEF8wvLx/5p/7elgP/0jZPSt1vbPFRRgNjZS+Gmf+ cAPn3j0xIiRIJrCvo9qiGsXLOOSr4mda7FGToIoKV7f9F6V2ykEK8h6jmcUvpjqy 7DIa7lU0IJBKhZXE2UgchsNUPnXKg7QewK4sxK7nLIz7xGUH3jaBXjssddnzccUm axlRszAva5uWFqDCRwjpFslVX+mNwSARTj9bYdN8ggd74zVT9Sr+qJNjnV7lSNYh axV7glYteC1afBrC43HDglbl8LmZnP3TMPnoQmUEyJmwlAoPv5zeQN+GPbV91/Ut qWGeBG0SNRh5GIkZP2HY01xUKmP3Aw2ReKEO8neppK2WWZ7iotnkjkhCGf+AU+bX FsC9x5gI0jEbmgpR7wqcEv0Po96cXgJLrwjvu/ZOpoBgH3yG+cNNPqfsenarYDy2 ifDn13+om194KcTxUUKepAEqWxMiv+qDiELtRdI+9dEca5eEVLWKbEZS4RAubBCK Iz+/KkUBqbiMrYWQ8u4+kkAeMdei0ed/64gTN2B9tXr7yl8oSGoVzYJTHzbNecuZ uA3ti2A7+6GG5vaIpvKSylRxtTMh7xvSUGJ373g5lQl9COxo66WncfcW/HlUEn3t fgB/Afv4BSisZi1gjTSSWg/CcsWDwgyEtOkEALRovflURR3s3pnUjQRrIvjS3X0y bWHwJHaG/jfCt5V49pYZ =n5HY -----END PGP SIGNATURE----- --Sig_/XN9bJXeKGZJLVqce.8vP9sB--