[talk] Holidaze, AWS, and astounding "clock drift outage"

Jim Thompson jim at netgate.com
Wed Jan 3 04:42:09 EST 2018

Newer Intel CPUs implement Process-Context Identifiers (PCIDs), though no BSD or Linux uses them yet AFAIK.

These should help a lot on TLB shoot downs. 

Though there is a pending patch on CR3 flush during context switch that would preclude same:


The best layperson accessible write-up I’ve seen is this:


If you just want the cloud rant: http://market-ticker.org/akcs-www?post=232732

The issue seems to be related to speculative execution. AMD gives a clue:


I found this pseudocode as a light reading example of what may be occurring


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