Architectural limitation for nbproc?

Hi all,

I’m migrating HAProxy to nodes with 2x20 core Xeons, for a total of 80 vcpus seen by the OS. I want to use cpu-map to pin processes to vcpus for performance reasons, and have two questions:

1. What is the specific reason(s) that MAX_PROCS is limited to 64? Can someone elaborate whether this is an architectural limitation?

2. Can you suggest configuration options for performance that takes into account the numa grouping (0-19,40-59 to node 0 and 20-39,60-79 to node 1) and could allow us to use all 80 vcpus?

I included some /proc/cpuinfo output below for clarity.

These systems currently receive hundreds of millions of tcp requests a day, with an average number of active connections somewhere between 60k and 80k.

Thanks in advance!

processor	: 79
vendor_id	: GenuineIntel
cpu family	: 6
model		: 85
model name	: Intel(R) Xeon(R) Gold 6230 CPU @ 2.10GHz
stepping	: 7
microcode	: 0x500002c
cpu MHz		: 1834.253
cache size	: 28160 KB

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