From nicolas at devels.es Wed May 18 13:47:55 2016 Content-Type: multipart/mixed; boundary="===============2936192033749857624==" MIME-Version: 1.0 From: =?utf-8?q?Nicol=C3=A1s_=3Cnicolas_at_devels=2Ees=3E?= To: users at ovirt.org Subject: Re: [ovirt-users] 100% memory usage on desktop environments Date: Wed, 18 May 2016 18:51:05 +0100 Message-ID: <573CAB89.1020109@devels.es> In-Reply-To: d37306c3c698445a8f4a6718ef2cc97e@exch2-4.slu.se --===============2936192033749857624== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------020802040705050604050109 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: 8bit El 18/05/16 a las 18:11, Karli Sj=C3=B6berg escribi=C3=B3: > > > Den 18 maj 2016 7:03 em skrev Nicol=C3=A1s : > > > > Hi Karli, > > > > El 18/05/16 a las 16:59, Karli Sj=C3=B6berg escribi=C3=B3: > >> > >> > >> Den 18 maj 2016 5:49 em skrev Nicol=C3=A1s : > >> > > >> > Hi, > >> > > >> > Probably not an oVirt issue, but maybe someone can help. I've = > deployed a > >> > pretty basic VM (ubuntu 14.04 server, 4GB RAM, 4 CPUs, 15GB storage). > >> > >> Just spitballing here: 14.04 only? Tried 16.04, or any other OS for = > that matter? For now, it sounds more guest related rather than oVirt. > >> > >> /K > > > > > > I tried a vanilla centos-7.1 as well and the same happens. I'm of = > the same opinion that this is more a guest related issue, it's just = > I'd like to find out why this only happens with QXL and not with CIRRUS. > > > > Thanks. > > Very interesting. Are your hosts all of the same architecture(family)? > > /K > Actually we have a nice mixture of manufacturers. We run 7 hosts, paired = 4-2-1 in relation to architecture. All of them have the same resources, = though (CPUs + RAM). In this case, I can't test the VM on different = hosts because we've separated one of them (one of the "4") on a = standalone oVirt datacenter as we're making tests on it, but I remember = this has already happened to me in the past (I didn't have the time to = debug it at that time, though). > > > >> > Each time I install an additional desktop environment (Gnome, KDE, > >> > whatever...), CPU usage rises to 100% all time to the extreme that > >> > interacting with the machine becomes impossible (maybe a mouse = > movement > >> > is propagated 3 minutes later or so...). > >> > > >> > To debug this, I installed LXDE, which is a lightweight desktop > >> > environment based on Xorg. I could see there is an Xorg process > >> > consuming one of the CPUs and the machine stops responding as far = > as the > >> > desktop environment goes. I have not changed anything in the > >> > configuration file. > >> > > >> > I could also see this only happens when QXL is chosen as the display > >> > driver. When CIRRUS is chosen, everything works smoothly and CPU is > >> > ~100% idle. The downside is that we want to use SPICE and CIRRUS = > won't > >> > allow it. > >> > > >> > Why does this happen? Is this an OS-side driver issue? Any hint = > how can > >> > it be fixed? > >> > > >> > Thanks. > >> > > >> > Nicol=C3=A1s > >> > _______________________________________________ > >> > Users mailing list > >> > Users(a)ovirt.org > >> > http://lists.ovirt.org/mailman/listinfo/users > > > > > --------------020802040705050604050109 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 8bit

El 18/05/16 a las 18:11, Karli Sj=C3=B6b= erg escribi=C3=B3:

Den 18 maj 2016 7:03 em skrev Nicol=C3=A1s <nicolas(a)devels.es><= /a>:
>
> Hi Karli,
>
> El 18/05/16 a las 16:59, Karli Sj=C3=B6berg escribi=C3=B3:
>>
>>
>> Den 18 maj 2016 5:49 em skrev Nicol=C3=A1s <nicolas(a)devels.es>:
>> >
>> > Hi,
>> >
>> > Probably not an oVirt issue, but maybe someone can help. I've deployed a
>> > pretty basic VM (ubuntu 14.04 server, 4GB RAM, 4 CPUs, 15GB storage).
>>
>> Just spitballing here: 14.04 only? Tried 16.04, or any other OS for that matter? For now, it sounds more guest related rather than oVirt.
>>
>> /K
>
>
> I tried a vanilla centos-7.1 as well and the same happens. I'm of the same opinion that this is more a guest related issue, it's just I'd like to find out why this only happens with QXL and not with CIRRUS.
>
> Thanks.

Very interesting. Are your hosts all of the same architecture(family)?

/K

Actually we have a nice mixture of manufacturers. We run 7 hosts, paired 4-2-1 in relation to architecture. All of them have the same resources, though (CPUs + RAM). In this case, I can't test the VM on different hosts because we've separated one of them (one of the "4") on a standalone oVirt datacenter as we're making tests on it, but I remember this has already happened to me in the past (I didn't have the time to debug it at that time, though).

>
>> > Each time I install an additional desktop environment (Gnome, KDE,
>> > whatever...), CPU usage rises to 100% all time to the extreme that
>> > interacting with the machine becomes impossible (maybe a mouse movement
>> > is propagated 3 minutes later or so...).
>> >
>> > To debug this, I installed LXDE, which is a lightweight desktop
>> > environment based on Xorg. I could see there is an Xorg process
>> > consuming one of the CPUs and the machine stops responding as far as the
>> > desktop environment goes. I have not changed anything in the
>> > configuration file.
>> >
>> > I could also see this only happens when QXL is chosen as the display
>> > driver. When CIRRUS is chosen, everything works smoothly and CPU is
>> > ~100% idle. The downside is that we want to use SPICE and CIRRUS won't
>> > allow it.
>> >
>> > Why does this happen? Is this an OS-side driver issue? Any hint how can
>> > it be fixed?
>> >
>> > Thanks.
>> >
>> > Nicol=C3=A1s
>> > _______________________________________________
>> > Users mailing list
>> > Users(a)ovirt.org
>> > http://lists.ovirt.org/mailman/listinf= o/users
>
>

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