[Users] Fwd: Re: Memory usage

Koen Vanoppen vanoppen.koen at gmail.com
Mon Feb 17 07:15:16 EST 2014 

Any updates about the issue? Because just now, the alarm went off again :-)
Kind regards,

Koen


2014-02-13 16:55 GMT+01:00 Martin Sivak <msivak at redhat.com>:

> Thank you.
>
> I wonder why mem_total is smaller than balloon_cur (and max). I will have
> to dig a bit more to see what happened.
>
> --
> Martin Sivák
> msivak at redhat.com
> Red Hat Czech
> RHEV-M SLA / Brno, CZ
>
> ----- Original Message -----
> > ---------- Forwarded message ----------
> > From: "david van zeebroeck" < david at analytics.brusselsairport.be >
> > Date: Feb 13, 2014 4:31 PM
> > Subject: Re: [Users] Memory usage
> > To: "Martin Sivak" < msivak at redhat.com >
> > Cc: "Doron Fediuck" < dfediuck at redhat.com >, "Koen Vanoppen" <
> > vanoppen.koen at gmail.com >, < users at ovirt.org >
> >
> > in attachement is the output of vdsclient
> >
> >
> >
> >
> > On Thu, Feb 13, 2014 at 2:26 PM, Martin Sivak < msivak at redhat.com >
> wrote:
> >
> >
> > Hi everybody,
> >
> > would it be possible to add the output of vdsClient getVmStats <affected
> vm
> > id> from the affected host here and to the bug?
> >
> > Also can we please get the bug number that tracks this issue? I could not
> > find it in BZ.
> >
> > --
> > Martin Sivák
> > msivak at redhat.com
> > Red Hat Czech
> > RHEV-M SLA / Brno, CZ
> >
> > ----- Original Message -----
> > >
> > >
> > > ----- Original Message -----
> > > > From: "Koen Vanoppen" < vanoppen.koen at gmail.com >
> > > > To: users at ovirt.org
> > > > Sent: Thursday, February 13, 2014 12:18:24 PM
> > > > Subject: Re: [Users] Memory usage
> > > >
> > > >
> > > >
> > > > We can't turn off the memory balloon option because we are running
> the
> > > > 3.3.2
> > > > with the bug of the memory balloon. Thx for the help!
> > >
> > > Which balloon bug?
> > >
> > > > On Feb 13, 2014 10:51 AM, "Doron Fediuck" < dfediuck at redhat.com >
> wrote:
> > > >
> > > >
> > > >
> > > >
> > > > ----- Original Message -----
> > > > > From: "René Koch" < rkoch at linuxland.at >
> > > > > To: "Doron Fediuck" < dfediuck at redhat.com >
> > > > > Cc: "Koen Vanoppen" < vanoppen.koen at gmail.com >, users at ovirt.org ,
> > > > > "Martin
> > > > > Sivak" < msivak at redhat.com >
> > > > > Sent: Thursday, February 13, 2014 11:16:27 AM
> > > > > Subject: Re: [Users] Memory usage
> > > > >
> > > > > On Thu, 2014-02-13 at 03:49 -0500, Doron Fediuck wrote:
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > > From: "René Koch" < rkoch at linuxland.at >
> > > > > > > To: "Doron Fediuck" < dfediuck at redhat.com >
> > > > > > > Cc: "Koen Vanoppen" < vanoppen.koen at gmail.com >,
> users at ovirt.org ,
> > > > > > > "Martin
> > > > > > > Sivak" < msivak at redhat.com >
> > > > > > > Sent: Wednesday, February 12, 2014 7:31:47 PM
> > > > > > > Subject: Re: [Users] Memory usage
> > > > > > >
> > > > > > > On Wed, 2014-02-12 at 11:22 -0500, Doron Fediuck wrote:
> > > > > > > >
> > > > > > > > ----- Original Message -----
> > > > > > > > > From: "René Koch" < rkoch at linuxland.at >
> > > > > > > > > To: "Koen Vanoppen" < vanoppen.koen at gmail.com >
> > > > > > > > > Cc: users at ovirt.org
> > > > > > > > > Sent: Wednesday, February 12, 2014 4:18:37 PM
> > > > > > > > > Subject: Re: [Users] Memory usage
> > > > > > > > >
> > > > > > > > > On Wed, 2014-02-12 at 15:14 +0100, Koen Vanoppen wrote:
> > > > > > > > > > In The GUI, it says it's using 25% of the memory.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > I guess it's the real value, right?
> > > > > > > > > The same happened for the memcached vm, someone reported
> to me
> > > > > > > > > -
> > > > > > > > > negative value in REST-API, but correct graph in oVirt
> webadmin
> > > > > > > > > GUI.
> > > > > > > > >
> > > > > > > > > I fear I have no idea how this can happen - so maybe
> someone
> > > > > > > > > else
> > > > > > > > > can
> > > > > > > > > help you troubleshoot this issue.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > 2014-02-12 15:10 GMT+01:00 Koen Vanoppen <
> > > > > > > > > > vanoppen.koen at gmail.com >:
> > > > > > > > > > Thanks for the quick respons, but there is no memcached
> > > > > > > > > > running on that VM.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Kind regards
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > 2014-02-12 15:06 GMT+01:00 René Koch <
> rkoch at linuxland.at >:
> > > > > > > > > >
> > > > > > > > > > On Wed, 2014-02-12 at 14:55 +0100, Koen Vanoppen
> > > > > > > > > > wrote:
> > > > > > > > > > > Dear all,
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > When we monitor one of our machines, we noticed
> > > > > > > > > > > that
> > > > > > > > > > there was one vm
> > > > > > > > > > > that was constantly giving a error of memory
> > > > > > > > > > > usage.
> > > > > > > > > > But when we took a
> > > > > > > > > > > look at it, there is actually nothing wrong with
> > > > > > > > > > > it.
> > > > > > > > > > Now we looked
> > > > > > > > > > > furhter then that. We looked at the API of the
> > > > > > > > > > machine and noticed
> > > > > > > > > > > something very strange:
> > > > > > > > > > >
> > > > > > > > > > > <statistic
> > > > > > > > > > >
> > > > > > > > > >
> href="/api/vms/3b9aa245-75ff-42e8-b921-1c9ce61826bf/statistics/b7499508-c1c3-32f0-8174-c1783e57bb08"
> > > > > > > > > >
> id="b7499508-c1c3-32f0-8174-c1783e57bb08"><name>memory.used</name><description>Memory
> > > > > > > > > > used (agent)</description><values
> > > > > > > > > >
> type="INTEGER"><value><datum>-944892806</datum></value></values><type>GAUGE</type><unit>BYTES</unit>
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > It's a negative...
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Do you have memcached running in this vm?
> > > > > > > > > >
> > > > > > > > > > I heard about this issue with memcached, but never
> > > > > > > > > > tested memcached in
> > > > > > > > > > my oVirt environment. You get the real usage value
> > > > > > > > > > with
> > > > > > > > > > memory.used = memory.installed + memory.used
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Regards,
> > > > > > > > > > René
> > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > What could be the problem?
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Kind regards,
> > > > > > > > > > >
> > > > > > > > > > > koen
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > >
> > > > > > > > Guys,
> > > > > > > > these values are usually a result of overcommitment mechanism
> > > > > > > > usage.
> > > > > > > > For example, if KSM is effective, it will free a lot of
> memory
> > > > > > > > pages,
> > > > > > > > and total-free-committed becomes negative.
> > > > > > >
> > > > > > >
> > > > > > > Thanks a lot for the information.
> > > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > > This was reported in
> > > > > > > > https://bugzilla.redhat.com/show_bug.cgi?id=977758
> > > > > > > > and the engine is using memFree reported by vdsm, which is
> more
> > > > > > > > accurate.
> > > > > > > >
> > > > > > > > The API reports the old version due to backwards
> compatibility.
> > > > > > >
> > > > > > >
> > > > > > > I just had a look at the bugzilla report and the RHEV
> documentation
> > > > > > > which says "Current memory in bytes used by the virtual
> machine.".
> > > > > > > So this means, the reported values are totally useless for
> > > > > > > monitoring
> > > > > > > memory usage of a virtual machine if KSM is active. I would
> expect
> > > > > > > to
> > > > > > > get the memory usage of a virtual machine and not how much
> memory
> > > > > > > is
> > > > > > > consumed on the hypervisor (this is pretty useless information
> for
> > > > > > > me).
> > > > > > >
> > > > > > > Is it planned to report the memory usage in a virtual machine
> in
> > > > > > > the
> > > > > > > API
> > > > > > > as well?
> > > > > > >
> > > > > > >
> > > > > > > Regards,
> > > > > > > René
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > René,
> > > > > > started digging into this, but it may take some time.
> > > > > >
> > > > > > Note that there are 2 memory usage reports; one for the host,
> > > > > > and another for each VM.
> > > > > > My response is related to the host, while the original question
> was
> > > > > > for the VM. I still think the root cause is the same (ie-
> related to
> > > > > > overcommitment; for example the VM may have a balloon inflated),
> but
> > > > > > would like to properly check and fix if needed.
> > > > >
> > > > >
> > > > > Yes, I know. So my question was if we can add another value for the
> > > > > usage in the vm in addition to the usage of the vm on the host.
> > > > >
> > > > We'll know once we understand the cause- ie is it a bug needs fixing
> or
> > > > should we indeed add another value
> > > >
> > > > If you have a setup with this issue, try removing the balloon device
> > > > and see if it helps / changes.
> > > >
> > > > >
> > > > > >
> > > > > > In order to make sure we keep track of it, please open a bug
> with all
> > > > > > the
> > > > > > relevant info.
> > > > > >
> > > > >
> > > > > I'll open a bug for this.
> > > > >
> > > > Thanks
> > > >
> > > > >
> > > > > > Thanks and keep reporting!
> > > > > > Doron
> > > > >
> > > > >
> > > > >
> > > >
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