[Bug 236233] Python multiprocessing is 4x slower with 11.2 compared to 11.0 kernel

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Mar 6 14:56:30 UTC 2019


--- Comment #5 from Konstantin Belousov <kib at FreeBSD.org> ---
If you disable KPTI by a knob, does the speed loss recover ?
Can you try on bare metal ?

There is no PCID feature advertised by the virtualized CPU, so we flush TLB on
each syscall entry and exit.  I suspect  Xen might have additional
pessimisations there comparing to the bare hardware.

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