RE: [Xen-users] howto upgrade

[SZABO Zsolt <szazs@xxxxxxxxx>]

On Tue, 27 Jan 2009, Robert Dunkley wrote:

> We saw time keeping issues with the Tyan B4989 Quads Opterons, I think
> it is fairly common. In the end we found using the /acpi=on (Might want
> to try numa=on as well) in the bootloader and setting hpet=0 in the VM
> config file reduced the problem significantly and NTP on the actual VMs
> could then compensate for small differences. This problem sounds similar
> to the one you are having in Dom 0, try changing the ACPI HPET option in
> the bios (If the VX50 has it).
Hi Rob,

thanks for the answer! Here are some new questions... :-)

What does HPET actually mean? In the BIOS I have found a Hammer 
Configuration menu in the Advanced section. In that there is a "ACPI 2.0 
Static Resources Affinity Table for ccNUMA systems" option which I have 
switched off (till this time it was Enabled). I am curious if that 
helps...
The timer problem often appeared already during the boot process of xen 
and sometimes it led to system hangup with
"BUG: soft lockup detected on CPU#2" (the number 2 is just an example)
messages...

Here you can find some typical logs:
http://www.mm.bme.hu/~szazs/tmp/xenlogs.php
(there was no backup after midnight between Jan 07 and Jan 25 because of a 
typo in the dirvish.conf)
On Jan 27 I could not reboot XEN because the backup partition get 
corrupted, so I have rebooted a simple debian kernel 
(2.6.24-etchnhalf-amd64) to rebuild-tree and to do some maintenance...
and I saw that raid1 has problem with sdd3 so I removed it from the 
mirror.
Since the reboot this morning it runs "smoothly" but I do not know whether
it is because of either the BIOS change or the rebuilt backup partition or 
the kicked off mirror partition...
> As for upgrading with rollback, this can be done by building the new
> kernel and adding it as a separate option in your bootloader (eg. Grub).
> I'm quite new to Kernel building and have only just got my first builds
> working so you might want to wait for advice from a more experienced
> user on that.
So the changed libs cannot be a problem...? Are there any special things 
when considering an upgrade? (from 3.1.x to 3.2.x the network bridge setup 
scripts have changed, so I needed some time to figure out the new syntax)
TIA,
--
Zsolt

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