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Status Submitted
Workspace Systems Design
Created by Guest
Created on Sep 8, 2022

Finally leverage "the mainframe lesson" and fully exploit NUMA in POWERsystems

Why run VIO servers in the same cores, DIMMs, buses, etc. as all your real workloads? Instead of a 2-socket / 2 NUMA domain system, sell us an asymmetric 4-socket / 4 NUMA domain system where 2 of the sockets / domains are much smaller and contain exactly half of the I/O (NVMe / PCIe, CAPI, etc.) each. Run a VIO server in each one, and almost zero hardware interrupts would ever have to hit the "main" processing hardware. (Low-low-low end might only have support for 1 VIO module) If the fabric (for lack of a more precise term) in between the NUMA domains scales well enough, you could add a ton of much smarter I/O modules to scale things more than just adding semi-smart drawers. If it really scales well, put "main memory" behind a similar module and leave the "main processors" to do almost all CPU-bound workloads. The OS and PowerVM would need a bunch of work for that last one, but might need near-zero work for the VIOS->I/O module design.
Idea priority Low