We recently upgrade from CentOS 5.8 to CentOS 5.9 on kernel-xen-2.6.18-348.3.1.el5, and after booting into the new kernel, noted large amounts of these messages every second or so in the logs:
Mar 30 21:38:35 atlas2 kernel: Warning Timer ISR/0: Time went backwards:
delta=-1393683849 delta_cpu”316151 shadow”5003685197135
off9240997 processed”5005208029053 cpu_processed”5003792029053
On both the dom0 and the domUs.
Some reading indicates that this _was_ a fault fixed in 2009/2010, but it seems to have resurfaced on the latest kernel.
For now, we’ve reverted back to an earlier kernel.
Has anybody else seen this recently, or got any insight?