Benchmarks show how much Spectre and Meltdown mitigation slow Intel chips

Stefan Mileschin · 22nd May 2019, 18:43

I expect you to die, Mr Intel,

Phoronix has been testing chips to see how bad Spectre and Meltdown patches harmed the performance of CPUs and the news is horrible for Intel.

Phoronix benchmarked across multiple Intel platforms, including the 6800K (Broadwell-E), 8700K (Coffee Lake), 7980XE (Skylake-SP), Ryzen 7 2700X, and Threadripper 2990WX.

It found while the impacts vary tremendously from virtually nothing too significant on an application-by-application level, the collective whack is ~15-16 per cent on all Intel CPUs without Hyper-Threading disabled. Disabling increases the overall performance impact to 20 per cent (for the 7980XE), 24.8 per cent (8700K) and 20.5 per cent (6800K).

The AMD CPUs were not tested with HT disabled, because disabling SMT isn’t a required fix for the situation on AMD chips, but the cumulative impact of the decline is much smaller. AMD loses just three per cent with all fixes enabled. The impact of these changes is enough to change the relative performance weighting between the tested solutions. With no fixes applied, across its entire test suite, the CPU performance ranking is:

1. 7980XE (288)
2. 8700K (271)
3. 2990WX (245)
4. 2700X (219)
5. 6800K. (200)

With the full suite of mitigations enabled, the CPU performance ranking is:

1. 2990WX (238)
2. 7980XE (231)
3. 2700X (213)
4. 8700K (204)
5. 6800K (159)

https://fudzilla.com/news/pc-hardwar...ow-intel-chips

22nd May 2019, 18:43	#1
Stefan Mileschin [M] Reviewer Join Date: May 2010 Location: Romania Posts: 148,553	Benchmarks show how much Spectre and Meltdown mitigation slow Intel chips I expect you to die, Mr Intel, Phoronix has been testing chips to see how bad Spectre and Meltdown patches harmed the performance of CPUs and the news is horrible for Intel. Phoronix benchmarked across multiple Intel platforms, including the 6800K (Broadwell-E), 8700K (Coffee Lake), 7980XE (Skylake-SP), Ryzen 7 2700X, and Threadripper 2990WX. It found while the impacts vary tremendously from virtually nothing too significant on an application-by-application level, the collective whack is ~15-16 per cent on all Intel CPUs without Hyper-Threading disabled. Disabling increases the overall performance impact to 20 per cent (for the 7980XE), 24.8 per cent (8700K) and 20.5 per cent (6800K). The AMD CPUs were not tested with HT disabled, because disabling SMT isn’t a required fix for the situation on AMD chips, but the cumulative impact of the decline is much smaller. AMD loses just three per cent with all fixes enabled. The impact of these changes is enough to change the relative performance weighting between the tested solutions. With no fixes applied, across its entire test suite, the CPU performance ranking is: 1. 7980XE (288) 2. 8700K (271) 3. 2990WX (245) 4. 2700X (219) 5. 6800K. (200) With the full suite of mitigations enabled, the CPU performance ranking is: 1. 2990WX (238) 2. 7980XE (231) 3. 2700X (213) 4. 8700K (204) 5. 6800K (159) https://fudzilla.com/news/pc-hardwar...ow-intel-chips

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