In recent years, meltdown circuit breaker, Spectre spectre two major security vulnerabilities not only impact the entire CPU processor industry, especially the spectre vulnerability, there are many versions, and new variants continue to appear.
Recently, Intel, Dutch University researchers have found a Spectre V2 ghost vulnerability version, for the branch history injection (BHI), can bypass some patches, Intel 4-12 generation Core, ARM Cortex/ Neoverse architecture is not spared.
According to actual measurements, after the Intel processor is patched with the corresponding patch, the performance will lose up to 35%.
AMD complete immunity? Not really.
Intel research found that the AMD processor patch is flawed, and the latter's repair method has also changed from LEFENCE/JMP to the conventional Retopole, which inevitably affects performance.
Phoronix compared the performance of the three processors of the Ryzen™ 9 5950X, Ryzen™ 9 5900HX, and Xiaolong 7F23 under Linux, all based on the Zen3 architecture, which were used for desktops, notebooks, and servers.
After the Ryzen 9 5950X patch, stess-NG (Context Switching) test performance actually lost as much as 54%, directly waist cut, but fortunately, in addition to other projects have little impact, up to 6.4%, the average is less than 1.5%, and even three projects do not fall but rise.
The Ryzen 9 5900HX was also the most impacted by the Stress-NG (Context Switching) project, losing 22 percent, with three other projects over 9 percent.
The Xiaolong 7F23 did its best, with Stress-NG (Context Switching) also down just 8.9 percent, and as many as 8 projects performing better, up nearly 4 percent at most.