Pkg xen devel - Jul 2007 - timer kernelpatch for xen-enabled kernels

Hi pkg-xen members,
Hi Bastian,

I had a lot of trouble with xen on my quite new notebook. It's a sony
notebook
with core 2 duo processor. In xen (dom0 & domU) I got a lot of "time
went
backwards" error messages. I think at least 100 msgs/10sec, which renders
the
system more or less unusable on the console. With "noapic" as boot
option
there are even more messages. About 1700 within 10 seconds. Furthermore 
within kde or gnome other strange effects appear, for example too fast 
blinking icons, multiple characters per keypress, and so on. Sometimes even 
the system reboots without any further message if kde or gnome gets started.

After some research I found a patch on the xen-devel mailinglist, which helps 
and fixes this problem. Xen hasn't applied it to upstream, because Jan Pratt
said, that there are too few people expierence this problem for changing 
something like the timer. For me it works perfectly.

After some more researches I found out, that booting with "nosmp" also
fixes
the problem, so this seems to be related to smp as well. Because the hardware 
used within my notebook is nothing special (normal intel chipset), I guess 
other people could need a solution too. Xen without smp on a multicore system 
isn't soooo cool :)

Bastian, can you apply the attached patch for the next -xen kernel images? 
Thanks!

What about applying the patch within our xen package? I haven't already 
commited this, because the debian xen kernel doesn't come from our xen 
package, so it would not really help for the debian xen kernel package. But 
should it be applied anyways? Maybe someone still uses our package to create 
their own kernel patch.

--Ralph
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