On Wed, Feb 8, 2017 at 5:47 PM, Fam Zheng <f...@redhat.com> wrote: > No, something is wrong. The polling shouldn't keep running when there is no > I/O > activity. > > Can you try "perf top" to see what poll handlers are spinning?
Samples: 288K of event 'cycles', Event count (approx.): 57149970643 Overhead Shared Object Symbol 16.96% qemu-system-x86_64 [.] lduw_le_phys 15.77% [vdso] [.] __vdso_clock_gettime 7.25% qemu-system-x86_64 [.] qemu_lockcnt_cmpxchg_or_wait 7.16% qemu-system-x86_64 [.] aio_poll 3.94% qemu-system-x86_64 [.] address_space_translate 3.69% qemu-system-x86_64 [.] qemu_lockcnt_dec 3.46% qemu-system-x86_64 [.] virtio_queue_host_notifier_aio_poll 3.32% qemu-system-x86_64 [.] address_space_translate_internal 2.54% qemu-system-x86_64 [.] run_poll_handlers_once 2.54% libpthread-2.19.so [.] pthread_mutex_lock 2.53% libpthread-2.19.so [.] __pthread_mutex_unlock_usercnt 2.53% qemu-system-x86_64 [.] aio_notify_accept 2.40% qemu-system-x86_64 [.] timerlist_deadline_ns 2.38% qemu-system-x86_64 [.] address_space_lookup_region 2.23% qemu-system-x86_64 [.] timerlistgroup_deadline_ns 2.21% qemu-system-x86_64 [.] qemu_lockcnt_inc 2.08% qemu-system-x86_64 [.] qemu_clock_get_ns 1.91% qemu-system-x86_64 [.] object_dynamic_cast_assert 1.54% qemu-system-x86_64 [.] virtio_queue_notify_aio_vq.part.16 1.21% qemu-system-x86_64 [.] qemu_map_ram_ptr 1.16% libc-2.19.so [.] __clock_gettime 1.02% qemu-system-x86_64 [.] event_notifier_poll 1.02% qemu-system-x86_64 [.] timerlistgroup_run_timers 1.02% qemu-system-x86_64 [.] virtio_queue_set_notification 0.82% qemu-system-x86_64 [.] aio_bh_poll 0.81% qemu-system-x86_64 [.] timerlist_run_timers 0.70% qemu-system-x86_64 [.] aio_dispatch 0.66% qemu-system-x86_64 [.] virtio_queue_empty.part.32 0.62% qemu-system-x86_64 [.] aio_compute_timeout 0.50% qemu-system-x86_64 [.] virtio_scsi_data_plane_handle_event 0.32% qemu-system-x86_64 [.] clock_gettime@plt 0.26% qemu-system-x86_64 [.] memory_region_is_ram_device 0.21% qemu-system-x86_64 [.] qemu_mutex_unlock 0.12% qemu-system-x86_64 [.] aio_context_acquire 0.12% qemu-system-x86_64 [.] iothread_run 0.12% qemu-system-x86_64 [.] qemu_lockcnt_count 0.11% qemu-system-x86_64 [.] pthread_mutex_lock@plt 0.11% qemu-system-x86_64 [.] qemu_mutex_lock 0.11% [kernel] [k] vmx_vcpu_run 0.10% libpthread-2.19.so [.] pthread_mutex_unlock 0.09% qemu-system-x86_64 [.] aio_context_release 0.09% qemu-system-x86_64 [.] pthread_mutex_unlock@plt 0.09% [kernel] [k] native_write_msr_safe 0.08% [kernel] [k] ksm_do_scan 0.07% qemu-system-x86_64 [.] virtio_scsi_handle_event_vq --Ed
