>On 20/11/2014 03:20, Zhang Haoyu wrote:
>> Hi all,
>>
>> If I press the one of "Insert/Delete/Home/End/PageUp/PageDown/UpArrow/
>> DownArrow/LeftArrow/RightArrow" key w/o releasing, then lots of interrupts
>> will be injected to vm(win7/win2008), about 8000/s, the system become very
>> slow,
>> bringing very bad experience. But the other keys are okay.
>> And, linux guest has no this problem.
>
>Do you have a trace for this? What version of QEMU and what UI backend?
>
Sorry for forgetting to mention test environment from the start.
Host: rhel7 with kernel-3.10.0-121
QEMU: qemu-2.0.2
Guest: win7(bad),win2008(bad),linux-kernel-3.10.0-121(good)
No UI backend, directly start the VM via qemu command.
perf top data when above problem happening:
PerfTop: 8710 irqs/sec kernel:69.5% exact: 0.0% [4000Hz cycles],
(target_pid: 22382)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
15.04% [kernel] [k] read_hpet
11.69% [kvm_intel] [k] vmx_vcpu_run
6.99% [kvm] [k] vcpu_enter_guest
5.22% [kvm] [k] kvm_vcpu_on_spin
4.76% [kernel] [k] __srcu_read_lock
4.31% libglib-2.0.so.0.3200.4 [.] g_hash_table_lookup
3.21% [kvm_intel] [k] __vmx_load_host_state
2.60% libglib-2.0.so.0.3200.4 [.] g_str_hash
2.49% [kvm_intel] [k] vmx_save_host_state
2.07% qemu-system-x86_64 [.] e1000_txmmio_poll
1.36% [kernel] [k] __srcu_read_unlock
1.24% libc-2.13.so [.] 0x00000000000e7582
1.05% qemu-system-x86_64 [.] start_xmit
1.04% [kvm] [k] kvm_fast_pio_in_complete_emulated_pio
1.04% [kvm_intel] [k] vmcs_writel
1.02% qemu-system-x86_64 [.] vnc_refresh_server_surface
0.99% [vdso] [.] 0x0000000000000847
0.98% [kernel] [k] native_read_tsc
0.93% [kernel] [k] fget_light
0.85% [kvm] [k] kvm_arch_vcpu_load
0.83% [kvm_intel] [k] vmx_cache_reg
0.79% [kvm] [k] kvm_arch_vcpu_ioctl_run
0.73% qemu-system-x86_64 [.] object_class_dynamic_cast
0.72% libpthread-2.13.so [.] pthread_mutex_lock
0.68% [kvm_intel] [k] add_atomic_switch_msr
0.63% [kvm] [k] emulator_pio_in_out.isra.101
0.62% [kernel] [k] recalc_sigpending
0.61% qemu-system-x86_64 [.] kvm_cpu_exec
0.59% qemu-system-x86_64 [.] kvm_arch_post_run
0.58% [kernel] [k] _raw_spin_lock_irq
7716 unprocessable samples recorded.
Thanks,
Zhang Haoyu
>Paolo
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