On Sun, Dec 02, 2012 at 12:41:37PM +0100, Nikola Ciprich wrote:
> 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
Something wrong with your symbols. This function cannot take that much.
It is three and a half instruction long and should be called only once
during vm startup.
> 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
>
>
>
>
> --
> -------------------------------------
> Ing. Nikola CIPRICH
> LinuxBox.cz, s.r.o.
> 28. rijna 168, 709 00 Ostrava
>
> tel.: +420 591 166 214
> fax: +420 596 621 273
> mobil: +420 777 093 799
>
> www.linuxbox.cz
>
> mobil servis: +420 737 238 656
> email servis: ser...@linuxbox.cz
> -------------------------------------
--
Gleb.
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