Am Tue, 17 Jan 2012 20:12:51 +0000 schrieb Joe Holden <li...@rewt.org.uk>:
> Hi guys, > > Has anyone else noticed the tendency for 9.0-R to be unable to > accurately keep time? I've got a couple of machines that have been > 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
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