Hi, in my initial report (https://marc.info/?l=kvm&m=160502183220080&w=2 - now fixed by c887c9b9ca62c051d339b1c7b796edf2724029ed) I saw degraded performance going back somewhere between v5.8 - v5.9-rc1. OpenBSD 6.8 (GENERIC.MP) guest performance (time ./test-build.sh) good: 0m13.54s real 0m10.51s user 0m10.96s system bad : 6m20.07s real 11m42.93s user 0m13.57s system bisected to first bad commit: 6b82ef2c9cf18a48726e4bb359aa9014632f6466 git bisect log: # bad: [e47c4aee5bde03e7018f4fde45ba21028a8f8438] KVM: x86/mmu: Rename page_header() to to_shadow_page() # good: [01c3b2b5cdae39af8dfcf6e40fdf484ae0e812c5] KVM: SVM: Rename svm_nested_virtualize_tpr() to nested_svm_virtualize_tpr() git bisect start 'e47c4aee5bde' '01c3b2b5cdae' # bad: [ebdb292dac7993425c8e31e2c21c9978e914a676] KVM: x86/mmu: Batch zap MMU pages when shrinking the slab git bisect bad ebdb292dac7993425c8e31e2c21c9978e914a676 # good: [fb58a9c345f645f1774dcf6a36fda169253008ae] KVM: x86/mmu: Optimize MMU page cache lookup for fully direct MMUs git bisect good fb58a9c345f645f1774dcf6a36fda169253008ae # bad: [6b82ef2c9cf18a48726e4bb359aa9014632f6466] KVM: x86/mmu: Batch zap MMU pages when recycling oldest pages git bisect bad 6b82ef2c9cf18a48726e4bb359aa9014632f6466 # good: [f95eec9bed76d42194c23153cb1cc8f186bf91cb] KVM: x86/mmu: Don't put invalid SPs back on the list of active pages git bisect good f95eec9bed76d42194c23153cb1cc8f186bf91cb # first bad commit: [6b82ef2c9cf18a48726e4bb359aa9014632f6466] KVM: x86/mmu: Batch zap MMU pages when recycling oldest pages Host machine is old Intel Core2 without EPT (TDP). TIA, Z.
