CPU

vCPU sharing in EC2: HVM to the rescue?

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I’ve been doing some testing to clarify what a vCPU in Amazon Web Services actually is. Over the course of the testing, I experienced inconsistent results on a 2-thread test on a 4-vCPU m3.xlarge system, due to the mislabeling of the vCPUs as independent single-core processors by the Linux kernel. This issue manifests itself in…

It’s Oracle patch time again

It’s yet again time for Oracle’s critical patch update (CPUJAN2008). The update will be released on Tuesday January 15, and as of yet there are no details on exactly what vulnerabilities have been found.