PCI (I/O) partitioning on Sub-Numa Clustering

Intel® Xeon® Processor and Server Products

Intel® Xeon® Processors, Data Center Products including boards, integrated systems, and RAID Storage

PCI (I/O) partitioning on Sub-Numa Clustering

36 Views

I understand to a level how SNC in Intel processors partitions CPU, memory and LLC into clusters. However it is not clear to me how PCI root complexes are divided among these sub-numa clusters. We have a Granite Rapids CPU in our lab and though we can see different PCI root complexes mapped to different sub-numa cluster presented as NUMA nodes but I want to understand 1) logically what is the scheme of this partitioning the PCI root complexes 2) Also like physical NUMA nodes are there penalties for accessing a PCI device shown on a remote Sub-NUMA cluster within a single physical NUMA and if so are by how much?

Thanks

Link Copied

0 Replies

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.