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<p class="MsoNormal"><span style="color:black">Hello again,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Sorry but I forgot to specify in the previous mail that machine deployed as VMWare VA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">The vmware-toolbox-cmd stat balloon return always 0.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Danny<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><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"> Danny Gurman
<br>
<b>Sent:</b> Friday, September 29, 2017 2:18 AM<br>
<b>To:</b> 'users@openvz.org' <users@openvz.org><br>
<b>Cc:</b> Rotem Inbar <RotemI@Radware.com>; Dima Paikin <DimaP@Radware.com>; Yohai Liebman <YohaiL@Radware.com>; Lior Komanski <LiorK@Radware.com>; Liat Vaknin <LiatV@Radware.com><br>
<b>Subject:</b> RE: OOM Killer invoked even that are available RAM and swap on the machine<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-family:"Arial",sans-serif">Hello all,</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">I will really appreciate assistance regarding the following issue:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">We have a product deployed on CentosOS 6.9 with OpenVZ.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Machine RAM size –
<b>32</b> GB + Swap file (16 GB).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The following described issue was reproduced on the OpenVZ kernels:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">2.6.32-042stab125.1 , 2.6.32-042stab123.9 , 2.6.32-042stab123.2, 2.6.32-042stab120.11<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">For debugging purpose the single
<b>container</b> on the host<b> was stopped</b>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">We observed that OOM Killer is invoked whenever host RAM usage without buffers reach ~13 GB:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Free command output (few seconds before OOM killer invoked):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">total used free shared buffers cached<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Mem: 32793080 23197272 9595808 920 135992 10276712<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"> -/+ buffers/cache:
<b>12784568</b> 20008512<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Swap: 16465916
<b>0</b> 16465916<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">On the message buffer, we see that the machine memory state just before the OOM killer invocation is:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">RAM: <b>2097074</b> / 2097152 [1] SWAP:
<b>1048576</b> / <b>1048576</b> [1] KMEM: 227942400 /<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Again , machine has 32 GB, only 13 GB is used, no swap usage – so where those wrong values came<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">from and why OOM killer is invoked in this stage?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">The issue is reproducible with similar results every time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Is it a known issue ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Should I open a defect for this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Also – is there a way to totally disable the OOM killer?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">I’ll be glad to provide any required detail (like sysctl –a output)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Danny
</span><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:13.5pt"><span class="ng-binding"><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:black">Danny Gurman</span></span><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:black"><br>
<span class="ng-binding">Dev Lead, APSolute Vision</span><br>
Email: <a href="mailto:danny.gurman@gmail.com" id="email_txt">danny.gurman@gmail.com</a>
<o:p></o:p></span></p>
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