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Re: [Xen-users] Xen PV warning messages on boot

I appreciate the info.  I sort of panicked when I did a dmidecode and got the message that there was no SMBIOS info but after your reply and reading a bit more in an attempt to gain a better grasp on paravirtualization, I feel better.  J


I’ll definitely try the xen.independent_wallclock setting.




- Phil


From: ciprian.pantea
Sent: Monday, February 20, 2012 11:44 AM
To: philq
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen PV warning messages on boot


Don't have any concerns regarding the clock, those messages just mean

that the system was expecting a hardware clock and it didn't find one because

of the way xen works with that.


Another think you should look at is the sysctl setting called


which is set to 0 by default and if you change it to 1 you're able to adjust the

time independently in the domu. This may get you rid of the clock messages you





On Mon, Feb 20, 2012 at 00:56, Phil Quesinberry wrote:


I'm trying to get a PV instance of CentOS 5.7 running on XCP.  I have 5.7
running in HVM mode on another box and it works fine but I would like to
maximize the VM's performance.

It ultimately boots up ok (without graphics) but starts out with the
following warnings:

rtc: IRQ 8 is not free
rtc: IRQ 8 is not free
i8042.c: No controller found.
Red Hat nash version starting
 Reading all physical volumes.  This may take a while...
 Found volume group "VolGroup00" using metadata type lvm2
 2 logical volume(s) in volume group "VolGroup00" now active
               Welcome to CentOS release 5.7 (Final)
               Press 'I' to enter interactive startup.
Cannot access the Hardware Clock via any known method.
Use the --debug option to see the details of our search for an access
Setting clock (utc): Sun Feb........... and so on

Hardware is a Dell T610.  Is this normal, or does it mean that the VT-d is
not working on the hardware or something?  Apparently I'll need to configure
VNC to access a graphical console, which is fine.

Any way to eliminate these warning messages or should I not have any
concerns about running a server in this environment?

Many thanks,

Phil Quesinberry
Q Systems Engineering, Inc.
Electronic Controls and Embedded Systems Development
(410) 969-8002

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