https://bugzilla.novell.com/show_bug.cgi?id=887697 https://bugzilla.novell.com/show_bug.cgi?id=887697#c0 Summary: kvm performance greatly degraded than opensuse12.3 Classification: openSUSE Product: openSUSE 13.1 Version: Final Platform: x86-64 OS/Version: openSUSE 13.1 Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: jhu@novell.com QAContact: qa-bugs@suse.de Found By: Community User Blocker: --- Hi Guys: Recently, I upgraded my pc from 12.3 to 13.1 then found a issue: when it is 12.3 ,run 3-4 kvm vms smoothly ; when it is 13.1 ,cpu eating to 100% after run 2 kvm vms. reproduct ways: jun:~ # virsh start sles10sp4 Domain sles10sp4 started jun:~ # virsh start sles11sp1 Domain sles11sp1 started jun:~ # top top - 17:01:45 up 19 min, 7 users, load average: 0.71, 0.52, 0.78 Tasks: 253 total, 1 running, 252 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.2 us, 99.8 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 6017344 total, 2658580 used, 3358764 free, 268520 buffers KiB Swap: 0 total, 0 used, 0 free, 1185280 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 8010 qemu 20 0 2452256 212472 8664 S 101.5 3.531 3:53.98 qemu-system-x86 8935 qemu 20 0 1611372 20908 8660 S 97.84 0.347 0:12.83 qemu-system-x86 7851 hujun 20 0 675440 23468 16444 S 1.658 0.390 0:02.11 gnome-terminal- 6741 root 20 0 288852 34336 15532 S 0.995 0.571 0:24.97 Xorg 8392 hujun 20 0 1156320 252512 53904 S 0.332 4.196 0:40.29 thunderbird-bin 8963 root 20 0 22308 1784 1172 R 0.332 0.030 0:00.03 top 1 root 20 0 50480 4416 2328 S 0.000 0.073 0:01.37 systemd 2 root 20 0 0 0 0 S 0.000 0.000 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.000 0.000 0:00.01 ksoftirqd/0 5 root 0 -20 0 0 0 S 0.000 0.000 0:00.00 kworker/0:0H 7 root rt 0 0 0 0 S 0.000 0.000 0:00.01 migration/0 8 root -2 0 0 0 0 S 0.000 0.000 0:00.00 rcuc/0 jun:~ # perf top Samples: 39K of event 'cycles', Event count (approx.): 12364313481 18.70% [kernel] [k] read_hpet 3.86% [kernel] [k] update_cfs_shares 3.62% [kvm] [k] vcpu_enter_guest 3.31% [kernel] [k] __schedule 3.18% [kernel] [k] native_read_tsc 2.63% [kernel] [k] update_curr 2.37% [kvm_intel] [k] vmcs_writel 2.19% [kernel] [k] native_write_msr_safe 1.92% [kvm] [k] kvm_arch_vcpu_load 1.77% [kernel] [k] native_read_msr_safe 1.59% [kvm_intel] [k] __vmx_load_host_state.part.36 1.57% [kernel] [k] cpuacct_charge 1.48% [kernel] [k] __switch_to 1.48% [kernel] [k] put_prev_task_fair 1.44% [kernel] [k] thread_return 1.44% [kernel] [k] pick_next_task_fair 1.36% [kernel] [k] set_next_entity 1.31% [kernel] [k] enqueue_entity 1.26% [kernel] [k] native_load_tr_desc 1.24% [kernel] [k] native_write_cr0 1.16% [kvm_intel] [k] vmcs_load 1.13% [kernel] [k] native_load_gdt 1.10% [kernel] [k] enqueue_task_fair 1.08% [kernel] [k] update_stats_wait_end 1.08% [kernel] [k] _raw_spin_lock_irqsave 1.06% [kernel] [k] rcu_note_context_switch 0.97% [kernel] [k] sched_clock_local 0.97% [kernel] [k] dequeue_task_fair 0.96% [kernel] [k] _raw_spin_unlock_irqrestore 0.94% [kvm_intel] [k] vmx_save_host_state 0.93% [kvm] [k] kvm_vcpu_kick 0.89% [kernel] [k] calc_delta_mine 0.76% [kernel] [k] clear_buddies 0.71% [kernel] [k] update_min_vruntime 0.71% [kernel] [k] rb_erase -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.