Date: Wed, 18 Jan 2012 07:50:49 +0100 From: Martin Sugioarto <martin@sugioarto.com> To: Joe Holden <lists@rewt.org.uk> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: Timekeeping in stable/9 Message-ID: <20120118075049.289954e8@zelda.sugioarto.com> In-Reply-To: <4F15D643.8000907@rewt.org.uk> References: <4F15D643.8000907@rewt.org.uk>
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--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 <lists@rewt.org.uk>: > 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--
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