https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666
--- Comment #128 from Mark Millard <marklmi26-f...@yahoo.com> --- (In reply to bawdyanarch...@disroot.org from comment #127) I'm not sure how your speculation would fit with Cortex-A72 vs. Cortex-A53 making a difference in my context. One area where A72 vs. A53 might have a relevant difference is: Cortex-A72 has speculative execution Cortex-A53 does not have speculative execution The Cortex-A72 needs to have some types cache content explicitly managed in places where speculative execution can have cache consequences visible if not handled correctly. I've seen code patched for what was reported to be such an issue for code that was starting to support A72's. (Not necessarily a FreeBSD context, just general looking around.) It leads me to wonder if something is not being properly forced to be up to date when used. Differing code sequences from tuning for different targets might have differing properties for such at some places in the code. Outside the A72 vs. 53 context, some machines might have similar variations in behavior, leading some to show problems and others not. But, I've still no solid evidence of a specific type of error in any specific place. The above is just an example of speculation on my part. -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-usb@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
