Date: Wed, 06 Mar 2019 14:56:27 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 236233] Python multiprocessing is 4x slower with 11.2 compared to 11.0 kernel Message-ID: <bug-236233-227-vmKZfcS4i5@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-236233-227@https.bugs.freebsd.org/bugzilla/> References: <bug-236233-227@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236233 --- Comment #5 from Konstantin Belousov <kib@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. --=20 You are receiving this mail because: You are the assignee for the bug.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-236233-227-vmKZfcS4i5>