Bisected: The Unfortunate Reason Linux 4.20 Is Running Slower

phoronix.com

54 pointsdeafcalculus6 comments

Since that one's the active discussion, we've moved the comments there.

Your dupe detector is broken. The URLs are the same, how did it not trigger?

The second has a different URL, the first probably didn't have enough upvotes to "arm" the dupe detector?

to save everyone the click on the dupes:

craftyguy 1 day ago | unvote [-]

tl;dr: The cause is the Single Thread Indirect Branch Predictors (STIBP) for cross-hyperthread Spectre mitigation on Intel processors.