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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The various ‘top’ tools, like htop and iotop, can be used to at least ‘spot check’ live performance and look for issues. You want to monitor “I/O wait”:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://unix.stackexchange.com/questions/419168/how-to-find-out-iowait-per-process-on-linux-with-top-command">https://unix.stackexchange.com/questions/419168/how-to-find-out-iowait-per-process-on-linux-with-top-command</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">For example, I found an issue with btrfs where file fragmentation over time was causing periodic long periods of blocked I/O and all suricata threads sitting
idle until the backlog was cleared. Enabling autodefrag for the volume and rebooting resolved this.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Coop<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Peter Manev <petermanev@gmail.com>
<br>
<b>Sent:</b> Friday, December 27, 2019 12:12 AM<br>
<b>To:</b> Nelson, Cooper <cnelson@ucsd.edu><br>
<b>Cc:</b> Michał Purzyński <michalpurzynski1@gmail.com>; Drew Dixon <dwdixon@umich.edu>; Daniel Wallmeyer <Daniel.Wallmeyer@cisecurity.org>; oisf-users@lists.openinfosecfoundation.org<br>
<b>Subject:</b> Re: [Oisf-users] Hardware specs for monitoring 100GB<o:p></o:p></span></p>
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I am trying to find a measurable,consistent, repetitive way of easy figuring out if the system bus becomes a bottle neck and when on huge speeds. Any suggestions or pointers are welcome :)<br>
<o:p></o:p></p>
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