[Users] Fwd: Re: Memory usage
Koen Vanoppen
vanoppen.koen at gmail.com
Thu Feb 13 10:35:17 EST 2014
---------- 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
> > > >
> > > >
> > > >
> > >
> > > _______________________________________________
> > > Users mailing list
> > > Users at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/users
> > >
> > _______________________________________________
> > Users mailing list
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> > http://lists.ovirt.org/mailman/listinfo/users
> >
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3b9aa245-75ff-42e8-b921-1c9ce61826bf
Status = Running
guestFQDN = galatea.brusselsairport.aero
memUsage = 26
acpiEnable = true
netIfaces = [{'inet6': [], 'hw': '52:54:00:49:11:9d', 'inet': ['192.168.99.19'], 'name': 'eth1'}, {'inet6': [], 'hw': '00:1a:4a:67:c4:b3', 'inet': ['10.110.50.84'], 'name': 'eth2'}, {'inet6': [], 'hw': '52:54:00:f1:22:48', 'inet': ['192.168.122.1'], 'name': 'virbr0'}]
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vmType = kvm
timeOffset = 0
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memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '9212976', 'swap_in': '0', 'pageflt': '20708', 'mem_total': '12197520', 'mem_unused': '2336844'}
guestName = galatea.brusselsairport.aero
elapsedTime = 1848416
displayType = qxl
cpuSys = 10.22
appsList = ['ovirt-guest-agent-1.0.8-1.el6', 'kernel-2.6.32-71.el6']
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username = None
hash = -3779086589437073991
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guestIPs = 192.168.99.19 10.110.50.84 192.168.122.1
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monitorResponse = 0
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cpuUser = 38.14
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clientIp =
displaySecurePort = 5901
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