Intel IPP status 37 (ippStsUnknownCacheSize): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: IPP supports the CPU but cannot determine its cache size for tuning.

Could be also:
Constant	Type	OS
KERN_TERMINATED	Kern return	Mac
ENOLCK	errno	Linux
EALREADY	errno	Mac
ECHRNG	errno	Solaris
NPFS_FILE_SYSTEM	BugCheck Code	Windows

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ippStsNotSupportedCpu	ippStsSymKernelExpected

ippStsUnknownCacheSize

This is a performance-tuning warning rather than a data-path failure. IPP may still execute the primitive, but cache-size-dependent blocking, threading, or dispatch heuristics cannot use precise cache information.

It can appear on unusual processors, virtual machines, or environments where CPUID cache reporting is incomplete.

Diagnostic focus

Record CPU model, CPUID leaves exposed to the process, and virtualization layer.
Treat output correctness separately from cache-tuning quality.
Compare performance with a native run if the warning appears only in a VM or container.

Intel IPP Error Reporting · IPP CPU feature functions

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