[Xen-devel] RE: Xen 4 TSC problems

[tommics <tp@xxxxxxxxxxxxxxxxxxxxxxx>]

Hey there,

just wanted to report that we also experience the same problem since
upgrading to xen 4.0.1 on debian squeeze. We are running latest debian
stable release.

ii  libxenstore3.0                          4.0.1-2          
ii  linux-image-2.6.32-5-xen-amd64          2.6.32-35squeeze2
ii  linux-image-xen-amd64                   2.6.32+29        
ii  xen-hypervisor-4.0-amd64                4.0.1-2          
ii  xen-linux-system-2.6-xen-amd64          2.6.32+29        
ii  xen-linux-system-2.6.32-5-xen-amd64     2.6.32-35squeeze2
ii  xen-qemu-dm-4.0                         4.0.1-2          
ii  xen-tools                               4.2-1            
ii  xen-utils-4.0                           4.0.1-2          
ii  xen-utils-common                        4.0.0-1          
ii  xenstore-utils                          4.0.1-2          

We also have the clock jumping 50 minutes into future. 

We are running IBM Blades  HS21 XM (Type 7995)  with Intel(R) Xeon(R) CPU
E5345  @ 2.33GHz.
We are also running the same configuration on another machine with Intel(R)
Xeon(R) CPU X7550  @ 2.00GHz where we dont experience this problems. Also we
didnt had those bugs running xen 3.1.0 with 2.6.18-5-xen-amd64 kernel.

We currently running one blade with disabled HPET, clocksoure=pit and
cpuidle=0 and another with HPET on and nothing else configured.

The main problem debugging this, is to wait for the next error to appear.
Until now both machines run fine without time jumping, but we did see that
time jump on the machine which is running with hpet enabled and no other
settings. 

We could help debugging here.

Regards
Thomas Pöhler


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