EPT.WALK_PENDING and DTLB_*_MISSES.WALK_ACTIVE

Software Tuning, Performance Optimization & Platform Monitoring

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

EPT.WALK_PENDING and DTLB_*_MISSES.WALK_ACTIVE

790 Views

Hi to all!

I am trying to profile an application running on a qemu-kvm VM. My host machine is a KabyLake processor with VT-x extensions. I am using perf-tool inside the VM to read the performance counters (by passing the -cpu=host flag to qemu and using the Guest PMU)

Regarding the TLB miss performance counters I have the following question:

Do the DTLB_LOAD_MISSES.WALK_ACTIVE and DTLB_STORE_MISSES.WALK_ACTIVE counters exclude the cycles spent walking the Extended Page Tables (EPT)? If this is the case to find out the total amount of cycles that the application spent on page walking (both guest page tables and extended page tables) I should add all counters: DTLB_LOAD_MISSES.WALK_ACTIVE + DTLB_STORE_MISSES.WALK_ACTIVE + EPT.WALK_PENDING?

Thank you very much in advance,

Chloe

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.