Date: Fri, 31 Jan 2020 19:58:38 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: freebsd-hackers@freebsd.org Subject: vm.pmap.pti=0 performance regression Message-ID: <20200131165838.GO38096@zxy.spb.ru>
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I am try to do different benchmark for my application (NETMAP based packet filtering) and see strange behavior: vm.pmap.pti=0 machdep.hyperthreading_allowed=0 caused performance drop about 20% on network thread. In case of vm.pmap.pti=1 machdep.hyperthreading_allowed=0 or vm.pmap.pti=1 SMT=off in bios or vm.pmap.pti=0 SMT=off in bios performance about same and high about 20%. How does that work?
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