8:34 p.m.
This is a multi-part message in MIME format.
--------------080502050502000507060404
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
On 01/08/2013 11:38 AM, Alex Leonhardt wrote:
thanks, yep noticed it has a negative value -
Amador, does that mean the host is overcommitting by 18 G of avail
physical memory although 20 G of phys memory is still free ?
memAvailable maps the worst case to the Host.
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.
memAvailable = FREE_OR_CACHED + RESIDENT - memCommitted - Host Reserved
Memory
Where:
FREE_OR_CACHED: from /proc/meminfo
RESIDENT: RSS value (2nd. field in /proc/<PID>/statm) from all running
VMs processes.
memCommitted --> Physical Memory Guaranteed + Guest Overhead
(default 65MB) from running VMs.
*Notice that memAvailable does not considers KSM work.
Alex
2013/1/7 Amador Pahim <apahim(a)redhat.com <mailto:apahim@redhat.com>>
On 01/07/2013 06:18 AM, Alex Leonhardt wrote:
> Hi,
>
> 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 ?
>
> See screenshot.
>
> Alex
>
>
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org <mailto:Users@ovirt.org>
> http://lists.ovirt.org/mailman/listinfo/users
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
--------------080502050502000507060404
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 01/08/2013 11:38 AM, Alex Leonhardt
wrote:<br>
</div>
<blockquote
cite="mid:CAH4_GUtdRR611ePSun8zLyoGumXmeZnTsinK1O-B5Vz1AxUE8Q@mail.gmail.com"
type="cite">
<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>
</div>
</blockquote>
<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>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<br>
*Notice that memAvailable does not considers KSM work.<br>
<br>
<blockquote
cite="mid:CAH4_GUtdRR611ePSun8zLyoGumXmeZnTsinK1O-B5Vz1AxUE8Q@mail.gmail.com"
type="cite">
<div dir="ltr"><br>
Alex<br>
<br>
</div>
<div class="gmail_extra"><br>
<br>
<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(a)redhat.com</a>&gt;</span><br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>
<div class="h5">
<div>On 01/07/2013 06:18 AM, Alex Leonhardt wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div dir="ltr">
<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>
</div>
See screenshot. <br>
<br>
Alex<br>
<br>
</div>
<br>
<fieldset></fieldset>
<br>
</div>
</div>
<div class="im">
<pre>_______________________________________________
Users mailing list
<a moz-do-not-send="true" href="mailto:Users@ovirt.org"
target="_blank">Users(a)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/user...
</pre>
</div>
</blockquote>
<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>
</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
</body>
</html>
--------------080502050502000507060404--