John, Thanks for pointing out the TOD clock. I should deep-dive into the architecture documentations to check if that really is the locigal counterpart of Intel's TCS with respect to the kernel code logic. I have not read the relevant s390x kernel source code, either. However, heuristically, if TOD register is 128-bit and TCS register is 64-bit, some structural differences must exist to explain, why the exception in s390x platform happened only after 417 days as it happened after 208 days in i386 world. I am not sure that I have a full explanation for what happened in our system yesterday.
Juha On 11.01.2013 23:47, John McKown wrote:
To the best of my knowledge, the z series hardware does not have anything like the TSC on Intel. We have a TOD clock; which is 128 bits. We also have a 128 bit CPU Clock Comparator. This is used to interrupt the system when the TOD clock matches it. But I've never looked at the z/Linux kernel source code to see what it does with these registers.
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