Intel Performance Hit 5x Harder Than AMD After Spectre, Meltdown Patches

'Phoronix has conducted a series of tests to show just how much the
Spectre and Meltdown patches have impacted the raw performance of
Intel and AMD CPUs. While the patches have resulted in performance
decreases across the board, ranging from virtually nothing to
significant depending on the application, it appears that Intel
received the short end of the stick as its CPUs have been hit five
times harder than AMD, according to ExtremeTech. From the report:

The collective impact of enabling all patches is not a positive for
Intel. While the impacts vary tremendously from virtually nothing to
significant on an application-by-application level, the collective
whack is about 15-16 percent on all Intel CPUs without Hyper-Threading
disabled. Disabling increases the overall performance impact to 20
percent (for the 7980XE), 24.8 percent (8700K) and 20.5 percent
(6800K).

The AMD CPUs are 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 ~3 percent
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 (from fastest to slowest): 7980XE (288),
8700K (271), 2990WX (245), 2700X (219), 6800K. (200). With the full
suite of mitigations enabled, the CPU performance ranking is (from
fastest to slowest): 2990WX (238), 7980XE (231), 2700X (213), 8700K
(204), 6800K (159).

In closing, ExtremeTech writes: "AMD, in other words, now leads the
aggregate performance metrics, moving from 3rd and 4th to 1st and 3rd.
This isn't the same as winning every test, and since the degree to
which each test responds to these changes varies, you can't claim that
the 2990WX is now across-the-board faster than the 7980XE in the
Phoronix benchmark suite. It isn't. But the cumulative impact of these
patches could result in more tests where Intel and AMD switch rankings
as a result of performance impacts that only hit one vendor."'

-- source: https://hardware.slashdot.org/story/19/05/20/228218

Cheers, Peter
-- 
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
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