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@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@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@redhat.com</a>></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@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> </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--