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CPU

Sapphire Rapids Memory Configuration

The 4th generation of the Intel Xeon Scalable Processors (codenamed Sapphire Rapids) was released early this year, and I’ve been trying...
frankdenneman
Feb 28, 2023 2 min read

vSphere 8 CPU Topology Device Assignment

There seems to be some misunderstanding about the new vSphere 8 CPU Topology Device Assignment feature, and I hope this article...
frankdenneman
Oct 25, 2022 3 min read

Machine Learning Workload and GPGPU NUMA Node Locality

In the previous article “PCIe Device NUMA Node Locality” I covered the physical connection between the processor and the PCIe device...
frankdenneman
Jan 30, 2020 10 min read

Explainer on #Spectre & #Meltdown by Graham Sutherland

Sometimes you stumble across a brilliant Twitter thread, so good, that it should never be lost. Graham Sutherland (@gsuberland) helped the...
frankdenneman
Jan 5, 2018 4 min read

Why the Recent Reported Intel HT Bug is Not in Your Data Center

Yesterday I tweeted out the warning message about the HT bug of Skylake and Kaby Lake processors posted on debian.org. https://lists.debian.org/debian-devel/2017/06/msg00308.html...
frankdenneman
Jun 26, 2017 1 min read

Contention on lightly utilized hosts

Often I receive the question why a virtual machine is not receiving resources while the ESXi host is lightly utilized and...
frankdenneman
Apr 27, 2011 3 min read

Beating a dead horse – using CPU affinity

Lately the question about setting CPU affinity is rearing its ugly head again. Will it offer performance advantages for the virtual...
frankdenneman
Jan 11, 2011 6 min read

Impact of oversized virtual machines part 3

In part 1 of the series of post on the impact of oversized virtual machines NUMA architecture, memory overhead reservation and...
frankdenneman
Jan 3, 2011 4 min read

Reservations and CPU scheduling

Most of my resource management articles focus more on the behavior of memory management than on CPU management. Mainly because the...
frankdenneman
Jun 8, 2010 4 min read