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<div class="moz-cite-prefix">On 01/08/2013 11:38 AM, Alex Leonhardt
wrote:<br>
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cite="mid:CAH4_GUtdRR611ePSun8zLyoGumXmeZnTsinK1O-B5Vz1AxUE8Q@mail.gmail.com"
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<div dir="ltr">thanks, yep noticed it has a negative value - <br>
<br>
Amador, does that mean the host is overcommitting by 18 G of
avail physical memory although 20 G of phys memory is still free
?<br>
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<br>
memAvailable maps the worst case to the Host.<br>
It means: considering your current state, to assure the "Physical
Memory Guaranteed" for all running VMs, you need 18GB of additional
RAM. This is the consequence of enabling overcommit policy. <br>
<br>
memAvailable = FREE_OR_CACHED + RESIDENT - memCommitted - Host
Reserved Memory<br>
<br>
Where:<br>
FREE_OR_CACHED: from /proc/meminfo<br>
RESIDENT: RSS value (2nd. field in /proc/<PID>/statm) from
all running VMs processes.<br>
memCommitted --> Physical Memory Guaranteed + Guest Overhead
(default 65MB) from running VMs.<br>
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*Notice that memAvailable does not considers KSM work.<br>
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<div dir="ltr"><br>
Alex<br>
<br>
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<div class="gmail_extra"><br>
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<div class="gmail_quote">2013/1/7 Amador Pahim <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:apahim@redhat.com"
target="_blank">apahim@redhat.com</a>></span><br>
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<div>On 01/07/2013 06:18 AM, Alex Leonhardt wrote:<br>
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<div>Hi,<br>
<br>
just seen a memory usage warning in oVirt's
Admin Interface saying the available memory is
below threshold of 1024MB - however - when I
checked the host, it had still 20GB left ? <br>
<br>
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See screenshot. <br>
<br>
Alex<br>
<br>
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<pre>_______________________________________________
Users mailing list
<a moz-do-not-send="true" href="mailto:Users@ovirt.org" target="_blank">Users@ovirt.org</a>
<a moz-do-not-send="true" href="http://lists.ovirt.org/mailman/listinfo/users" target="_blank">http://lists.ovirt.org/mailman/listinfo/users</a>
</pre>
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<pre style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:start;font-style:normal;font-weight:normal;padding:0px;line-height:14px;text-transform:none;font-size:12px;white-space:pre-wrap;margin:0px;word-spacing:0px">The message is happening due to "memAvailable" statistic coming from vdsm. The memAvailable field can be negative and considers a set of values from different sources to compose its result (free memory, cached memory, resident set size from qemu processes, committed memory from running vms and host reserved memory</pre>
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