The "What If" Performance Cost To Kernel Page Table Isolation On AMD CPUs
Written by Michael Larabel in Software on 14 October 2021. Page 2 of 4. 28 Comments

Workloads involving a lot of I/O and other kernel activity tend to show up as measurably impacted from KPTI, just as was the case when enabling KPTI on Intel for Meltdown.

Real-world I/O workloads like SQLite and KeyDB did show a measurable impact on performance to KPTI enabled.

Likewise, the networking workloads can take a measurable hit from KPTI.

The synthetic tests can at times show some more pronounced workloads, but even for real-world test cases like WireGuard networking performance having KPTI enabled on the AMD Zen 3 desktop CPU did result in noticeably slower performance.

Gaming and other graphical workloads showed little difference in the resulting FPS performance, similar to KPTI on Intel.


Related Articles
Trending Linux News