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AMD Preparing PCIe TPH Support For Upcoming CPUs
A new patch series sent out today by AMD Linux engineers confirm that PCIe TPH will be supported with 'upcoming AMD hardware' as a nice performance optimization feature for PCI Express.
Given the timing of these patches and AMD tending to not work on Linux enablement multiple generations out, this is presumably for Zen 5 processors. When running on Broadcom NICs with proper firmware, Cache Injection shows substantial memory bandwidth saving using real-world benchmarks." With this patch series besides the core PCIe TPH enablement in the Linux kernel, only the Broadcom BNXT "bnxt_en" network driver is initially modified for making use of PCIe TPH support but hopefully other driver adaptations will come in time now that hardware support will be rolling out.
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