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On 18 Apr 2017, at 11:46, Nelson Lameiras =
<nelson.lameiras(a)lyra-network.com> wrote:
=20
Hello,
=20
A new vm setting "maximum memory" has appeared in oVirt >4 which by =
default has the value "current memory=E2=80=9D*4
In 4.1
=20
- Why is "maximum memory" setting necessary to set?
- Why isn't this value set to "infinity" by default ?
Because it=E2=80=99s recommended to be about 4x the startup size by =
linux kernel
=20
It seems to me kind of uselessly counter productif to have to decide a =
maximum
memory amount beforehand. if we do this, will we have to set =
maximum CPU cores also in the future (being devil's advocate here ;) )
You don=E2=80=99t have to decide, you can keep the default 4x.
For CPUs it is not currently needed and is set according to =
engine-config maximum supported by qemu-kvm - 288 in 4.1
Thanks,
michal
.
=20
I did searched oVirt documentation, but very little information is =
available.
Maybe this is an libvirt question, but I'm hopping a oVirt guru
could =
quickly enlighten me.
=20
cordialement, regards,
=20
<element-signature_logo_lyra_115x94.jpg>
<https://www.lyra-network.com/>
Nelson LAMEIRAS
Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux / Systems and Networks =
engineer
Tel: +33 5 32 09 09 70
nelson.lameiras(a)lyra-network.com =
<mailto:nelson.lameiras@lyra-network.com>
<https://payzen.eu/>
<element-signature_logo_YouTube_32x28.jpg> =
<https://www.youtube.com/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA>
<element-signature_logo_LinkedIn_41x28.jpg> =
<https://www.linkedin.com/company/lyra-network_2>
<element-signature_logo_Twitter_42x28.jpg> =
<https://twitter.com/LyraNetwork>
<element-signature_payzen_61x28.jpg>
<https://payzen.eu/>
Lyra Network, 109 rue de l'innovation, 31670 Lab=C3=A8ge, FRANCE
=20
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<html><head><meta http-equiv=3D"Content-Type"
content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""><div><blockquote
type=3D"cite" class=3D""><div =
class=3D"">On 18 Apr 2017, at 11:46, Nelson Lameiras <<a =
href=3D"mailto:nelson.lameiras@lyra-network.com" =
class=3D"">nelson.lameiras(a)lyra-network.com</a>&gt;
wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div
class=3D""><div =
style=3D"font-family: arial, helvetica, sans-serif; font-size: 12pt;" =
class=3D""><div class=3D"">Hello,<br
class=3D""></div><div class=3D""><br =
data-mce-bogus=3D"1" class=3D""></div><div
class=3D"">A new vm setting =
"maximum memory" has appeared in oVirt >4 which by default has the =
value "current memory=E2=80=9D*4<br data-mce-bogus=3D"1" =
class=3D""></div></div></div></div></blockquote><div><br
=
class=3D""></div>In 4.1</div><div><br
class=3D""><blockquote type=3D"cite"=
class=3D""><div class=3D""><div
class=3D""><div style=3D"font-family: =
arial, helvetica, sans-serif; font-size: 12pt;" class=3D""><div =
class=3D""><br data-mce-bogus=3D"1"
class=3D""></div><div class=3D"">- =
Why is "maximum memory" setting necessary to =
set?</div></div></div></div></blockquote></div><div><blockquote
=
type=3D"cite" class=3D""><div class=3D""><div
class=3D""><div =
style=3D"font-family: arial, helvetica, sans-serif; font-size: 12pt;" =
class=3D""><div class=3D"">- Why isn't this value set to
"infinity" by =
default
?</div></div></div></div></blockquote><div><br =
class=3D""></div><div>Because it=E2=80=99s recommended to be
about 4x =
the startup size by linux kernel</div><div class=3D""><br =
class=3D""></div><blockquote type=3D"cite"
class=3D""><div class=3D""><div=
class=3D""><div style=3D"font-family: arial, helvetica, sans-serif;
=
font-size: 12pt;" class=3D""><div class=3D""><br
data-mce-bogus=3D"1" =
class=3D""></div><div class=3D"">It seems to me kind of
uselessly =
counter productif to have to decide a maximum memory amount beforehand. =
if we do this, will we have to set maximum CPU cores also in the future =
(being devil's advocate here ;) )<br data-mce-bogus=3D"1" =
class=3D""></div></div></div></div></blockquote><div><br
=
class=3D""></div>You don=E2=80=99t have to decide, you can keep the =
default 4x.</div><div>For CPUs it is not currently needed and is set =
according to engine-config maximum supported by qemu-kvm - 288 in =
4.1</div><div><br =
class=3D""></div><div>Thanks,</div><div>michal</div><div>.<br
=
class=3D""><blockquote type=3D"cite"
class=3D""><div class=3D""><div =
class=3D""><div style=3D"font-family: arial, helvetica, sans-serif;
=
font-size: 12pt;" class=3D""><div class=3D""><br
data-mce-bogus=3D"1" =
class=3D""></div><div class=3D""><div
class=3D"">I did searched oVirt =
documentation, but very little information is available.</div><div =
class=3D"">Maybe this is an libvirt question, but I'm hopping a oVirt =
guru could quickly enlighten me.<br
class=3D""></div></div><div =
class=3D""><br data-mce-bogus=3D"1"
class=3D""></div><div =
data-marker=3D"__SIG_PRE__" class=3D""><div
class=3D"">cordialement, =
regards,</div><div class=3D""><br data-mce-bogus=3D"1"
=
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line-height: 16px; width: 86.25pt; text-align: left;" =
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font-family: =
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font-weight: bold;" class=3D"">Nelson
LAMEIRAS</td></tr><tr class=3D""><td=
style=3D"font-family: Arial,sans-serif; color: #2b3c7a; font-size: =
11px; line-height: 16px;" data-mce-style=3D"font-family: =
Arial,sans-serif; color: #2b3c7a; font-size: 11px; line-height: 16px;" =
class=3D"">Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux<span =
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11px;" data-mce-style=3D"font-family: Arial,sans-serif; color: #337ab7; =
font-size: 11px;" class=3D""> / Systems and Networks =
engineer</span></td></tr><tr class=3D""><td
style=3D"line-height: 16px; =
font-family: 'Arial',sans-serif; color: #2b3c7a; font-size: 11px;" =
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data-mce-style=3D"font-family: Arial,sans-serif; color: #2b3c7a; =
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