How Linux KSM Is Saving Memory in Virtualized Environments

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How Linux KSM Is Saving Memory in Virtualized Environments

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Kernel Same-page Merging (KSM) is a Linux kernel feature that deduplicates identical memory pages across processes and virtual machines. In this episode, Lucas and Luna explore how KSM works under the hood, why it's critical for virtualized and containerized workloads, and where it falls short. They walk through a real-world example: a KVM host running 20 Ubuntu VMs that saved over 40 percent of RAM using KSM, based on benchmarks from the Linux Foundation's 2025 virtualization report. Lucas explains the trade-offs — CPU overhead versus memory efficiency — and why KSM is not a silver bullet for every scenario. They also discuss the emerging alternative, UBC (Userspace Block Compiler), and how KSM fits into the broader Linux memory management landscape. A focused, technical conversation for anyone running servers at scale. #Linux #KSM #KernelSamepageMerging #MemoryDeduplication #Virtualization #KVM #QEMU #LinuxKernel #MemoryManagement #Containerization #OpenSource #CloudComputing #DevOps #SysAdmin #Technology #FexingoBusiness #BusinessPodcast #LinuxPodcast Keep every episode free: buymeacoffee.com/fexingo

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