LinuxQuestions.org
Download your favorite Linux distribution at LQ ISO.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Hardware
User Name
Password
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

Notices


Reply
  Search this Thread
Old 08-11-2020, 11:08 AM   #1
Toadman
Member
 
Registered: Aug 2002
Location: Copperas Cove, Texas
Distribution: Ubuntu 18.04 LTS
Posts: 291

Rep: Reputation: 21
Netdata reports 10min cpu iowait


Netdata has been running since 1 Aug however since 4 Aug it's been reporting the below:

Code:
"3:26:49 AM",system.cpu,"10min cpu iowait",16.5%,CLEAR
"3:19:49 AM",system.cpu,"10min cpu iowait",41.2%,WARNING
"8/8/2020 3:32:49 AM",system.cpu,"10min cpu iowait",16.9%,CLEAR
"8/8/2020 3:19:49 AM",system.cpu,"10min cpu iowait",40.9%,WARNING
"8/7/2020 3:28:48 AM",system.cpu,"10min cpu iowait",16.8%,CLEAR
"8/7/2020 3:19:48 AM",system.cpu,"10min cpu iowait",41.1%,WARNING
"8/4/2020 3:31:46 AM",system.cpu,"10min cpu iowait",16.2%,CLEAR
"8/4/2020 3:19:46 AM",system.cpu,"10min cpu iowait",40.5%,WARNING
Some system info:

Code:
Kernel	Linux 5.4.0-42-generic (x86_64)
Version	#46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020
Distribution	Ubuntu 18.04.5 LTS
Processors
Package Information
Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz	0	0:0	2731.74 MHz
Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz	1	0:1	2787.58 MHz
MemTotal Total Memory	15326184 KiB
SwapTotal	Virtual Memory	4089852 KiB
It seems to start at the same time within a few seconds. I see nothing odd in syslog. The only thing that is running during that time is an rsync backup to an external usb drive. It starts at 03:10am each morning and ends depending on how much data is backed up. For instance on 08/04 it started at 03:10 and ended 03:25. Other days noted in the log:

Code:
04/07 03:10 - 03:22
04/08 03:10 - 03:26
04/11 03:10 - 03:20
Honestly I'm not sure if this is even anything to be concerned about. If any more data is needed I'd be happy to provide it.
 
Old 08-11-2020, 02:38 PM   #2
berndbausch
LQ Guru
 
Registered: Nov 2013
Location: Tokyo
Distribution: A few
Posts: 5,309

Rep: Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600Reputation: 1600
iowait normally means disk IO. The fact that it happens at the time the backup runs is not surprising.

Use top or vmstat to check if you have a large iowait figure now, and iostat to check your current IO activity. sar also reports these metrics.
 
2 members found this post helpful.
Old 08-11-2020, 03:40 PM   #3
Toadman
Member
 
Registered: Aug 2002
Location: Copperas Cove, Texas
Distribution: Ubuntu 18.04 LTS
Posts: 291

Original Poster
Rep: Reputation: 21
Ran iostat, it all looks good to me so I'll agree with you that it's more than likely the backup causing it. Just something I never noticed before running Netdata.

Code:
iostat -c 5 25
Linux 5.4.0-42-generic (localhost) 	08/11/2020 	_x86_64_	(2 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          12.78    0.03    4.02    1.38    0.00   81.80
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           5.14    0.00    2.82    0.00    0.00   92.04
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           4.77    0.00    2.03    0.30    0.00   92.90
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          15.28    0.00    5.93    1.71    0.00   77.09
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           8.76    0.00    3.02    1.81    0.00   86.40
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           5.34    0.00    2.62    0.20    0.00   91.83
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          15.94    0.00    3.83    0.20    0.00   80.02
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          13.69    0.00    4.70    0.90    0.00   80.72
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          14.21    0.00    4.74    0.71    0.00   80.34
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          35.77    0.00   12.58    0.09    0.00   51.55
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          30.41    0.00    8.69    4.44    0.00   56.47
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          43.50    0.00   14.00    3.02    0.00   39.48
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          14.45    0.00    2.64    0.00    0.00   82.91
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           9.01    0.00    3.40    0.40    0.00   87.19
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           5.84    0.00    3.22    0.00    0.00   90.95
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          17.60    0.00    6.20    0.40    0.00   75.80
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           8.81    0.00    4.20    1.60    0.00   85.39
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           5.99    0.00    3.69    0.30    0.00   90.02
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          15.43    0.00    4.51    0.30    0.00   79.76
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          17.20    0.00    5.30    1.90    0.00   75.60
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          10.01    0.00    3.70    0.50    0.00   85.79
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           8.57    0.00    3.69    1.10    0.00   86.64
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           5.34    0.00    3.12    0.60    0.00   90.94
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          20.44    0.00    6.91    2.00    0.00   70.64
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          12.54    0.00    3.78    3.78    0.00   79.90
I'll mark this thread as solved, appreciate the reply
 
1 members found this post helpful.
Old 08-11-2020, 06:45 PM   #4
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 19,089

Rep: Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322Reputation: 3322
Quote:
Originally Posted by Toadman View Post
Just something I never noticed before running Netdata.
Just another questionable metric used inappropriately. Get some users to log on around then and play some games. Problem solved.
 
1 members found this post helpful.
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Performance Q - CPU and iowait instrumentpilot Linux - Newbie 1 11-02-2011 03:06 PM
Dual core cpu, 2 scp processes, 100% iowait. john.daker Linux - Newbie 4 06-22-2009 08:16 AM
High Load, Low CPU/RAM/iowait ? newlinuxnewbie Linux - Server 1 09-22-2006 09:24 AM
High loadavg, low CPU & iowait reichhartkg Linux - General 1 07-28-2006 03:44 PM
[REDHAT KDE] Disable KDE boot? Apache down after 10min losing monitor signal bjwesselink Linux - Software 2 08-11-2003 01:52 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 07:09 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration