title: Debian server Systemd-journald use high CPU
body: <p>systemd-journal seems to have hig CPU usage(60~70%)</p>
  
  <pre><code># journalctl
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00 PREC=0x00 TTL=64 ID=25585 DF PROTO=TCP SPT=43
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54980 DF PROTO=TCP SPT=33
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54980 DF PROTO=TCP SPT=33
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00 PREC=0x00 TTL=64 ID=25586 DF PROTO=TCP SPT=43
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00 PREC=0x00 TTL=64 ID=25586 DF PROTO=TCP SPT=43
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54981 DF PROTO=TCP SPT=33
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54981 DF PROTO=TCP SPT=33
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00 PREC=0x00 TTL=64 ID=25587 DF PROTO=TCP SPT=43
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00 PREC=0x00 TTL=64 ID=25587 DF PROTO=TCP SPT=43
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_IN:IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.0.0.1 DST=127.0.0.1 LEN=120 TOS=0x00
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54982 DF PROTO=TCP SPT=33
  Jun 11 17:31:14 hotname.example kernel: BANDWIDTH_OUT:IN= OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=160 TOS=0x08 PREC=0x00 TTL=64 ID=54982 DF PROTO=TCP SPT=33
  </code></pre>
  
  <p>And /var/log/debug ,syslog,bandwidth,kern.log file size increases very quickly.</p>
  
  <p>What is the cause? What is the solution?</p>