Description of problem: NUMA (Non-Uniform Memory Access) systems can interact badly with realtime applications by causing unexpected event latencies. We need tuning content that is specific to dealing with NUMA hardware.
Added the following section to the "Realtime Tuning" chapter, until more info received: <section id="sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-Non_Uniform_Memory_Access"> <title>Non-Uniform Memory Access</title> <para> Non-Uniform Memory Access (NUMA) is a design used to allocate memory resources to a specific CPU. This can improve access time and results in fewer memory locks. Although this sounds like it would be useful for reducing latency, NUMA systems have been known to interact badly with realtime applications, as they can cause unexpected event latencies. </para> <para> For more information about the NUMA API, see Andi Kleen's whitepaper <ulink url="http://www.halobates.de/numaapi3.pdf">An NUMA API for Linux</ulink>. </para> </section> LKB
If no further information on this section received by Friday 16 May, then information currently in the guide will be assumed to be correct. Any further information/updates to occur in the 1.1 docs. LKB
Shak, So, what does BIOS interleaving actually do? And is that what it's always going to be called in the BIOS setup screen(s)? We're trying to get something together for user consumption that will give them an idea of how to setup their system for RT, so the language needs to be clear.
Closing this bug for now. Any further edits/additions to this section to be included in 1.1 docs (a new bug will be required in that case). LKB