Time went backwards again

Time went backwards again

[Holger Steinhaus]

I just tested a fresh version of xen-3.2-testing.hg on my small server
(2x Opteron 244, dual socket, single-core) . Everything seems to work,
unless I tried to activate frequency scaling.

After passing cpufreq=dom0-kernel to Xen and loading the powernow-k8
module in Dom0, the kernel begins to complain about timer problems (see
below). Using xen-unstable.hg leads to exactly the same preblems.
Besides the messages, powernow seems to be working as expected. Xen and
the kernel are compiled for AMD64 architecture.

Regards,
  Holger

Timer ISR/0: Time went backwards: delta=-772014563 delta_cpu=17985437
shadow=6991766977225 off=441008699 processed=6992980000000
cpu_processed=6992190000000
 0: 6992190000000
 1: 6992980000000
Timer ISR/0: Time went backwards: delta=-782009778 delta_cpu=17990222
shadow=6991766977225 off=451013384 processed=6993000000000
cpu_processed=6992200000000
 0: 6992200000000
 1: 6993000000000
Timer ISR/1: Time went backwards: delta=-773366551 delta_cpu=-773366551
shadow=6992226619530 off=15294 processed=6993000000000
cpu_processed=6993000000000
 0: 6992210000000
 1: 6993000000000
Timer ISR/0: Time went backwards: delta=-771946797 delta_cpu=18053203
shadow=6991766977225 off=461076499 processed=6993000000000
cpu_processed=6992210000000
 0: 6992210000000
 1: 6993000000000
Timer ISR/1: Time went backwards: delta=-763370578 delta_cpu=-763370578
shadow=6992226619530 off=10010461 processed=6993000000000
cpu_processed=6993000000000
 0: 6992220000000
 1: 6993000000000