From fernando.frediani at upx.com.br Fri Dec 30 19:12:29 2016 Content-Type: multipart/mixed; boundary="===============1477460041588346940==" MIME-Version: 1.0 From: Fernando Frediani To: users at ovirt.org Subject: Re: [ovirt-users] Using zRam with oVirt Nodes Date: Fri, 30 Dec 2016 17:12:21 -0200 Message-ID: In-Reply-To: CAJgorsaLkPqhrNvK7ttWx2EwpJ_pzQh3T6KW4AsXF7GPNj3jqg@mail.gmail.com --===============1477460041588346940== 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. --------------C7F99C471D9E0D4B42D95D5F Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: 7bit Hello it's the same thing zswap. The use case is to be able to put more stuff in a single host without it = need needing to swap to slow disks. You sacrifice CPU and avoid a lot = slower swap to disk. Fernando On 30/12/2016 16:41, Yaniv Kaul wrote: > > > On Dec 30, 2016 7:06 PM, "Fernando Frediani" = > > = > wrote: > > Hello folks. > > On simple libvirt/KVM hosts in order to improve RAM usage and > avoid swap to disk I use zRam with swap to RAM technique. So > create half of amount of host memory in zRam disk divided by the > number of CPU cores. Works pretty well. > > Has anyone tried it with oVirt Nodes or even has it been > considered as a feature to simply turn on/off ? > > > What exactly is the use case? > I'd use zram for temporary disks, using the VDSM hook for them. > I think you are referring to zswap? > Y. > > > Thanks > Fernando > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > > --------------C7F99C471D9E0D4B42D95D5F Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 8bit

Hello it's the same thing zswap.

The use case is to be able to put more stuff in a single host without it need needing to swap to slow disks. You sacrifice CPU and avoid a lot slower swap to disk.

Fernando

On 30/12/2016 16:41, Yaniv Kaul wrote:

On Dec 30, 2016 7:06 PM, "Fernando Frediani" <fernando.fre= diani(a)upx.com.br> wrote:

Hello folks.

On simple libvirt/KVM hosts in order to improve RAM usage and avoid swap to disk I use zRam with swap to RAM technique. So create half of amount of host memory in zRam disk divided by the number of CPU cores. Works pretty well.

Has anyone tried it with oVirt Nodes or even has it been considered as a feature to simply turn on/off ?

What exactly is the use case?=C2=A0

I'd use zram for temporary disks, using the VDSM hook for them.=C2=A0

I think you are referring to zswap?=C2=A0

Y.=C2=A0

Thanks
Fernando

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

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