Lightboard Lessons: CPU Hyper-Threads and TMM
In this episode of Lightboard Lessons, Jason details how BIG-IP’s Traffic Management Microkernel (TMM) utilizes Intel’s Hyper-Threading Technology (on applicable platforms) and the impacts depending ...
Published Sep 06, 2017
Version 1.0JRahm
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Joined January 20, 2005
JRahm
Admin
Joined January 20, 2005
JRahm
Sep 07, 2017Admin
Great question Zack. The disaggregator (or DAG as we call it, also referenced as the cmp hash) distributes load to all TMMs as requests come in by vlan (configurable in vlan advanced settings 11.3+, see notes in K14358 linked above on CMP), rather than fill one bucket and move to the next. So you should see all TMMs grow together. If you have the default cmp hash and an application that has same src/dst ports (like ntp), that can overwhelm a single TMM if traffic is heavy for that application as all the traffic will be hashed to the same TMM.