VMware ESXi: Retbleed fixes cause 70% performance loss in Linux VMs running kernel 5.19

Posted on 2022-09-14 by guenni

In performance regression testing, VMware testers found a severe performance drop for Linux guests when running kernel 5.19 in a VMware ESXi virtual machine with the Retbleed fixes installed. The degradation was up to 70% for computing, up to 30% in networking, and up to 13% in memory usage. Details can be found in this post. (via)

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