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[Xen-users] Ubuntu Jaunty (9.04) as DomU Clock Issue

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Alexandr R. Ogurtzoff" <iscander@xxxxxxxxx>
  • Date: Tue, 23 Jun 2009 20:03:18 +0300
  • Delivery-date: Tue, 23 Jun 2009 10:04:28 -0700
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Hi, there
I got another issue with Ubuntu's 9.04 Xen-able for DomU kernel:
I run it as virtual instance and see my  clocks are wrong, and I have
no way to tune clocks inside VM:
VM's config is:  /etc/xen/app.cluster.xen
# this is autogenerated by Ganeti, please do not edit
kernel = '/boot/vmlinuz-2.6-xenU'
ramdisk = '/boot/initrd-2.6-xenU'
memory = 256
vcpus = 1
name = 'app.cluster.xen'
vif = ['mac=aa:00:00:3e:98:e4, bridge=br0']
disk = ['phy:/var/run/ganeti/instance-disks/app.cluster.xen:0,sda,w']
root = '/dev/xvda1'
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
extra = 'clock=jiffies'
^^^^^^ I set it to jiffies after Debian's expirence.

/boot/initrd-2.6-xenU -> initrd.img-2.6.28-11-server
 /boot/vmlinuz-2.6-xenU -> vmlinuz-2.6.28-11-server

That's almost fine. I got ntp run on VM, but time is wrong and it
seems it is 5 times slowly.  But I found another surprise from
Ubuntu's kernel - there is no xen.independent_wallclock option for
this kernel!

The VM's kernel
uname -a
Linux app.cluster.xen 2.6.28-11-server #42-Ubuntu SMP Fri Apr 17
02:48:10 UTC 2009 i686 GNU/Linux

root@app:~# sysctl -w xen.independent_wallclock=1
error: "xen.independent_wallclock" is an unknown key
root@app:~# cat
root@app:~# cat
xen tsc jiffies

Is any solution to run it with correct clocks?

For Dom0 I'm trying  Ubuntu's xen 3.3 with Debian's 2.6.26-2-xen-686 kernel.
It is PVM and I have not "vt" option for my CPU so HVM unavailable.

Thank you in advance for solution
My best wishes.
Alexandr Ogurtsov.

Linux is very friendly it is just picky who its friends are

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