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iftop taking 100% CPU and not responding
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araxon
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Joined: 25 May 2011
Posts: 61

PostPosted: Thu Aug 06, 2020 10:17 am    Post subject: iftop taking 100% CPU and not responding Reply with quote

I was just testing my Ceph setup on 10Gbit network and all of a sudden iftop just stopped responding. This is the last screen it displayed: image.

What is particularly odd is the negative peak values on the bottom:
Code:
TX:             cum:    123GB   peak:   -7891870
RX:                    69.7GB           2.91Gb
TOTAL:                  193GB           -5201120


It now takes 100% of one CPU core and does not respond even when poked with Ctrl+C:
Code:
top - 12:12:13 up 1 day,  1:31,  3 users,  load average: 1.09, 1.16, 1.35
Tasks: 234 total,   1 running, 233 sleeping,   0 stopped,   0 zombie
%Cpu(s):  6.3 us,  0.0 sy,  0.0 ni, 93.6 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
MiB Mem :  63728.4 total,   1711.3 free,   2529.0 used,  59488.1 buff/cache
MiB Swap:   1023.9 total,   1023.9 free,      0.0 used.  60586.3 avail Mem

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
 35503 root      20   0  230988   6600   5276 S 100.0   0.0  19:25.72 iftop
  5171 ceph      20   0  553844 237664  27708 S   0.3   0.4   1:30.63 ceph-mgr
  5210 ceph      20   0 1153664 770656  25852 S   0.3   1.2   9:18.76 ceph-mon
  5327 ceph      20   0 2167320 516472  32152 S   0.3   0.8   6:09.91 ceph-osd


Is this a known overflow error? Didn't find a thing in bugtracker...
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