Spectre Mitigation Performance Impact Benchmarks On AMD Ryzen 3700X / 3900X Against Intel

Written by Michael Larabel in Software on 15 July 2019 at 10:15 AM EDT. Page 2 of 3. 22 Comments.
Benchmark Result

With the Sockperf test stressing the throughput performance of the kernel's socket interfaces, the mitigations caused a 20% hit to the Core i9 9900K while the Ryzen 7 3700X saw a 13% hit and the Ryzen 9 3900X a 10% hit in the default state. The Core i9 9900K still delivered better performance for this synthetic benchmark than the AMD CPUs even with Intel's greater mitigations. Interestingly though and what I alluded to in the introduction, the Ryzen 7 2700X saw a 5.5% hit and the Ryzen 9 2990WX a 6.2% hit.

Benchmark Result

In workloads like compiling the LLVM stack, there was a small but measurable difference on the tested systems.

Benchmark Result

With the Hackbench Linux kernel scheduler benchmark, the Intel CPUs have a much greater impact (sans the 7960X) and the unmitigated Core i9 9900K with no mitigations was as fast as the Ryzen 7 3700X only to become much slower with mitigations.

Benchmark Result
Benchmark Result

The Glibc performance impact of these mitigations was greater on the Intel systems, but even so their performance in these C library micro-benchmarks did still come out stronger than the tested AMD combinations.


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