On 01/05/2018 03:15, Dag-Erling Smørgrav wrote: > Eric McCorkle <[email protected]> writes: >> The obvious downside is that you take a performance hit storing things >> in non-cacheable locations, especially if you plan on doing heavy >> computation in that memory (say, encryption/decryption). However, this >> is almost certainly going to be less than the projected 30-50% >> performance hit from other mitigations. > > Where did you get those numbers? Because the worst documented case for > KPTI is ~20% for I/O-intensive workloads, and PCID is likely to bring > this down to single digits if used correctly. The KAISER paper claims a > slowdown of < 1%, but that may have been the result of undisclosed > features of the specific CPU they tested on.
Those were numbers being thrown around. I'm not putting a lot of stake in them. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "[email protected]"
