From Ryan.Groten at stantec.com Tue Sep 29 17:14:31 2015 Content-Type: multipart/mixed; boundary="===============6374484644636735913==" MIME-Version: 1.0 From: Groten, Ryan To: users at ovirt.org Subject: [ovirt-users] Memory Optimization settings Date: Tue, 29 Sep 2015 21:14:29 +0000 Message-ID: --===============6374484644636735913== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --_000_b04cf8b58a7a49189a5c21f1a05b1b84CD1001M21corpads_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable On a cluster I can configure Memory Optimization "for server loads" (150% o= =3D vercommit) or "for desktop loads" (200% overcommit). This relates to memory page sharing right? If so what's the downside of ju= =3D st setting it as high as possible? Thanks, Ryan --_000_b04cf8b58a7a49189a5c21f1a05b1b84CD1001M21corpads_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable

On a cluster I can configure Mem= =3D ory Optimization “for server loads” (150% overcommit) or “= =3D ;for desktop loads” (200% overcommit).

This relates to memory page shar= =3D ing right? If so what’s the downside of just setting it as high= =3D as possible?

Thanks,

Ryan<= =3D o:p>

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boundary="===============7766891345782087236==" MIME-Version: 1.0 From: Amador Pahim To: users at ovirt.org Subject: Re: [ovirt-users] Memory Optimization settings Date: Wed, 30 Sep 2015 08:55:54 -0300 Message-ID: <560BCDCA.8090309@redhat.com> In-Reply-To: b04cf8b58a7a49189a5c21f1a05b1b84@CD1001-M21.corp.ads --===============7766891345782087236== 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. --------------050303090808090506060702 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: 8bit On 09/29/2015 06:14 PM, Groten, Ryan wrote: > > On a cluster I can configure Memory Optimization =E2=80=9Cfor server load= s=E2=80=9D = > (150% overcommit) or =E2=80=9Cfor desktop loads=E2=80=9D (200% overcommit= ). > > This relates to memory page sharing right? If so what=E2=80=99s the down= side = > of just setting it as high as possible? > This is how much more memory you will use to create VMs. Using 150%, a = hypervisor with 10GB of RAM will run up to 15 x 1GB VMs or 10 x 1,5GB = VMs and so on. If it happens all VMs using all memory in the same time, = you have KSM working to deduplicate memory pages and, as a last = resource, enough swap to avoid the oom killer. The best setting here depends on your workload. If you already know your = VMs will use all memory they have, so the less the better. If you want a = big number of VMs and they are not going to stress the memory that much, = you can play with the values and find what fits better for you. > Thanks, > > Ryan > > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users --------------050303090808090506060702 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 8bit

On 09/29/2015 06:14 PM, Groten, Ryan wrote:

On a cluster I can configure Memory Optimization =E2=80=9Cfor server loads=E2=80= =9D (150% overcommit) or =E2=80=9Cfor desktop loads=E2=80=9D (200% overco= mmit).

This relates to memory page sharing right?=C2=A0 If so what=E2=80=99s the downside of = just setting it as high as possible?

This is how much more memory you will use to create VMs. Using 150%, a hypervisor with 10GB of RAM will run up to 15 x 1GB VMs or 10 x 1,5GB VMs and so on. If it happens all VMs using all memory in the same time, you have KSM working to deduplicate memory pages and, as a last resource, enough swap to avoid the oom killer.

The best setting here depends on your workload. If you already know your VMs will use all memory they have, so the less the better. If you want a big number of VMs and they are not going to stress the memory that much, you can play with the values and find what fits better for you.

=C2=A0

Thanks,<= /p>

Ryan

_______________________________________________
Users mailing list
Use=
rs(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

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