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As @sebsued points out, it may well become a DoS vector itself, because if I understand the mitigation right, RDRAND ops are now *serialized against the entire chip memory bus*. They block all other cores from doing any reads and writes that miss cache. https://twitter.com/sebsued/status/1270639456312311809?s=19 …
I just did a test. One thread of RDRAND on an unpatched Xeon E-2144G (8 threads) drops 7-threaded sysbench performance by 10%. The same with the patch, 55%. So with the patch, a rogue core can now halve your memory performance. But it gets better.
Running 8 threads (on an 8-thread E-2144G) of RDRAND in the background, memory throughput drops by *81%* with the patch vs unpatched (91% vs idle). So if someone can spawn a bunch of RDRAND threads, they can drop your memory perf to 19% of what it would be, 9% of nominal.
Next time I will buy a Intel CPU, please shoot me...
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