[Bug 226968] IRQ storm on cpu0 timer when holding down key on USB keyboard

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226968

--- Comment #16 from Johannes Lundberg <johalun0 at gmail.com> ---
The top two (those with significant count):

  callout_reset_sbt_on                              
              kernel`tcp_timer_activate+0xfd
              kernel`tcp_do_segment+0x1191
              kernel`tcp_input+0xf1e
              kernel`ip_input+0x3f7
              kernel`netisr_dispatch_src+0xa2
              kernel`ether_demux+0x16e
              kernel`ether_nh_input+0x3cc
              kernel`netisr_dispatch_src+0xa2
              kernel`ether_input+0x8f
              kernel`tcp_lro_flush+0x217
              kernel`tcp_lro_flush_all+0x13b
              kernel`_task_fn_rx+0xe27
              kernel`gtaskqueue_run_locked+0x139
              kernel`gtaskqueue_thread_loop+0x88
              kernel`fork_exit+0x84
              kernel`0xffffffff80a0d27e
            37803
  callout_reset_sbt_on                              
              kernel`ukbd_timeout+0x153
              kernel`softclock_call_cc+0x150
              kernel`softclock+0x7c
              kernel`intr_event_execute_handlers+0x99
              kernel`ithread_loop+0xb7
              kernel`fork_exit+0x84
              kernel`0xffffffff80a0d27e
           183378

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