Disabling DDIO Globally or per-PCIe Root Port after Skylake

Software Tuning, Performance Optimization & Platform Monitoring

Discussion regarding monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform updating.

Disabling DDIO Globally or per-PCIe Root Port after Skylake

159 Views

After Skylake, it *appears* that the two IIO Configuration Registers iiomiscctrl and perfctrlsts_0 are no longer relevant for toggling DDIO support. To make matters worse, it isn't exposed in the BIOS of any server vendors offering Intel CPUs.

How might one disable DDIO on newer CPUs (e.g., Granite Rapids) on which the supplied I/O throughput renders it counterproductive?

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.