VM Performance Showing Mixed Impact With Linux 4.15 KPTI Patches
Written by Michael Larabel in Software on 3 January 2018. Page 3 of 4. 27 Comments

Interestingly, PostgreSQL takes a smaller hit in performance with KPTI when running in a VM than when running on bare metal hardware. This may be due to the bare metal tests having higher I/O potential than the virtual disk used in this scenario.

Similar to the bare metal results, Redis also took a performance hit with this newer kernel code.

Some synthetic tests via Stress-NG are also indicating a measurable drop in performance.

Apache is also taking a hit of just under 10% on this VM when KPTI is being used.

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