Timer/ISR1 Errors Have Returned In Kernel-xen-2.6.18-348.3.1.el5

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Hi all,

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?

Thanks, David

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