Fragen? Antworten! Siehe auch: Alternativlos
Hier ist DragonflyBSD dazu. Money Quote:
Unfortunately, the only mitigation possible is to remove the
kernel memory mappings from the user MMU map, which means that every single
system call and interrupt (and the related return to userland later) must
reload the MMU twice. This will add 150ns - 250ns of overhead to every
system call and interrupt. System calls usually have an overhead of only
100ns, so now it will be 250nS - 350nS of overhead on Intel CPUs.[…]
I should note that we kernel programmers have spent decades trying to
reduce system call overheads, so to be sure, we are all pretty pissed off
at Intel right now. Intel's press releases have also been HIGHLY DECEPTIVE.
[…]
These bugs (both Meltdown and Spectre) really have to be fixed in the CPUs
themselves. Meltdown is the 1000 pound gorilla. I won't be buying any new Intel chips that require the mitigation. I'm really pissed off at Intel.
OpenBSD macht drei Kreuze, dass sie zumindest auf ARM nicht betroffen sind.Und von FreeBSD hört man, dass Intel ihnen einen Tag vor Weihnachten (!) Bescheid gegeben hat. Hey, äh, Jungs, öhm, ihr müsst da mal kurz euren Code ein bisschen umschreiben!1!! Ja super!
Update: Hier ein Statement der Linux-Leute, die auch eher unzufrieden wirken.