Hi,
while trying to find source of KVM guest slowness, I noticed following in perf top:
326.00 19.6% vmx_set_supported_cpuid /lib/modules/3.0.53lb6.02/kernel/arch/x86/kvm/kvm-intel.ko
108.00 6.5% kvm_arch_dev_ioctl /lib/modules/3.0.53lb6.02/kernel/arch/x86/kvm/kvm.ko
100.00 6.0% tick_dev_program_event [kernel.kallsyms]
78.00 4.7% __remove_hrtimer [kernel.kallsyms]
52.00 3.1% acpi_processor_reevaluate_tstate /lib/modules/3.0.53lb6.02/kernel/drivers/acpi/processor.ko
45.00 2.7% find_busiest_group [kernel.kallsyms]
43.00 2.6% do_raw_spin_lock [kernel.kallsyms]
my question is, is this normal? I tried googling for vmx_set_supported_cpuid but am not
really clever about it...
here's snippet from trace-cmd:
version = 6
CPU 11 is empty
cpus=12
qemu-kvm-7766 [000] 235066.551604: kvm_msi_set_irq: dst 1 vec 51 (LowPrio|logical|edge|rh)
qemu-kvm-7766 [000] 235066.551606: kvm_apic_accept_irq: apicid 0 vec 81 (LowPrio|edge)
qemu-kvm-7767 [001] 235066.551618: kvm_inj_virq: irq 81
qemu-kvm-7767 [001] 235066.551620: kvm_entry: vcpu 0
qemu-kvm-7767 [001] 235066.551625: kvm_exit: reason EPT_MISCONFIG rip 0xffffffff81023d96 info 0 0
qemu-kvm-7767 [001] 235066.551630: kvm_emulate_insn: [FAILED TO PARSE] rip=18446744071578992022 csbase=0 len=2 insn=ARRAY[8b, 00, c9, 89, c0, c3,
0f, 1f, 40, 00, 55, 48, 89, e5, 0f] flags=9 failed=0
qemu-kvm-7767 [001] 235066.551631: vcpu_match_mmio: gva 0xffffc900000040f0 gpa 0xfed000f0 Read GPA
qemu-kvm-7767 [001] 235066.551632: kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0
qemu-kvm-7767 [001] 235066.551634: kvm_userspace_exit: reason KVM_EXIT_MMIO (6)
qemu-kvm-7767 [001] 235066.551648: kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0xfed25f11
qemu-kvm-7767 [001] 235066.551649: kvm_entry: vcpu 0
qemu-kvm-7767 [001] 235066.551650: kvm_exit: reason EPT_MISCONFIG rip 0xffffffff81023d96 info 0 0
qemu-kvm-7767 [001] 235066.551652: kvm_emulate_insn: [FAILED TO PARSE] rip=18446744071578992022 csbase=0 len=2 insn=ARRAY[8b, 00, c9, 89, c0, c3,
0f, 1f, 40, 00, 55, 48, 89, e5, 0f] flags=9 failed=0
qemu-kvm-7767 [001] 235066.551652: vcpu_match_mmio: gva 0xffffc900000040f0 gpa 0xfed000f0 Read GPA
qemu-kvm-7767 [001] 235066.551653: kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0
qemu-kvm-7767 [001] 235066.551653: kvm_userspace_exit: reason KVM_EXIT_MMIO (6)
qemu-kvm-7767 [001] 235066.551656: kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0xfed26450
qemu-kvm-7767 [001] 235066.551657: kvm_entry: vcpu 0
qemu-kvm-7767 [001] 235066.551659: kvm_exit: reason EPT_MISCONFIG rip 0xffffffff81023d96 info 0 0
qemu-kvm-7767 [001] 235066.551660: kvm_emulate_insn: [FAILED TO PARSE] rip=18446744071578992022 csbase=0 len=2 insn=ARRAY[8b, 00, c9, 89, c0, c3,
0f, 1f, 40, 00, 55, 48, 89, e5, 0f] flags=9 failed=0
qemu-kvm-7767 [001] 235066.551660: vcpu_match_mmio: gva 0xffffc900000040f0 gpa 0xfed000f0 Read GPA
qemu-kvm-7767 [001] 235066.551660: kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0
qemu-kvm-7767 [001] 235066.551661: kvm_userspace_exit: reason KVM_EXIT_MMIO (6)
qemu-kvm-7767 [001] 235066.551663: kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0xfed2672b
qemu-kvm-7767 [001] 235066.551664: kvm_entry: vcpu 0
qemu-kvm-7767 [001] 235066.551667: kvm_exit: reason APIC_ACCESS rip 0xffffffff810219eb info 10b0 0
qemu-kvm-7767 [001] 235066.551667: kvm_apic: apic_write APIC_EOI = 0x0
qemu-kvm-7767 [001] 235066.551668: kvm_eoi: apicid 0 vector 81
qemu-kvm-7767 [001] 235066.551668: kvm_entry: vcpu 0
qemu-kvm-7767 [001] 235066.551681: kvm_exit: reason EPT_MISCONFIG rip 0xffffffff81023d96 info 0 0
qemu-kvm-7767 [001] 235066.551682: kvm_emulate_insn: [FAILED TO PARSE] rip=18446744071578992022 csbase=0 len=2 insn=ARRAY[8b, 00, c9, 89, c0, c3,
0f, 1f, 40, 00, 55, 48, 89, e5, 0f] flags=9 failed=0
qemu-kvm-7767 [001] 235066.551683: vcpu_match_mmio: gva 0xffffc900000040f0 gpa 0xfed000f0 Read GPA
qemu-kvm-7767 [001] 235066.551683: kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0
qemu-kvm-7767 [001] 235066.551684: kvm_userspace_exit: reason KVM_EXIT_MMIO (6)
(I can store trace-cmd file somewhere if it can help).
This host is x86_64 centos6, running kernel 3.0.53 with kvm-kmod-3.6 and qemu-kvm-1.2.0
If I could provide more information, I'll be happy to do so..
BR
nik
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Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
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