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Hello michal,=20
Thanks for your answers.=20
If others have same questions, I did found this information below on oVirt =
web site (
http://www.ovirt.org/develop/release-management/features/engine/m=
aximum-memory-size/)=20
Note on size of maximum memory=20
If memory hot-plug is not required, max memory can be set to be the same as=
VM memory. Suggested value is 4x size of VM memory. Larger max memory is d=
iscouraged because:=20
* I can make QEMU process to start for longer time.=20
* If hot plugged memory is also required to be hot unpluggable, it need=
s to be considered as movable by the guest kernel. Kernel requires the amou=
nt of movable memory to be at most 4x larger that non-movable memory for st=
able run.=20
* On PowerPC platform continuous block of non-movable memory of size 1/=
64 of the max memory needs to be allocated for each VM.=20
cordialement, regards,=20
=09Nelson LAMEIRAS=20
Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux / Systems and Networks enginee=
r=20
Tel: +33 5 32 09 09 70=20
nelson.lameiras(a)lyra-network.com=20
www.lyra-network.com |
www.payzen.eu=20
=09
=09
=09
Lyra Network, 109 rue de l'innovation, 31670 Lab=C3=A8ge, FRANCE=20
From: "Michal Skrivanek" <michal.skrivanek(a)redhat.com>=20
To: "Nelson Lameiras" <nelson.lameiras(a)lyra-network.com>=20
Cc: "ovirt users" <users(a)ovirt.org>=20
Sent: Tuesday, April 18, 2017 11:55:46 AM=20
Subject: Re: [ovirt-users] vm "maximum memory" setting questions=20
On 18 Apr 2017, at 11:46, Nelson Lameiras < nelson.lameiras(a)lyra-network.co=
m > 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=20
In 4.1=20
BQ_BEGIN
- Why is "maximum memory" setting necessary to set?=20
BQ_END
BQ_BEGIN
- Why isn't this value set to "infinity" by default ?=20
BQ_END
Because it=E2=80=99s recommended to be about 4x the startup size by linux k=
ernel=20
BQ_BEGIN
It seems to me kind of uselessly counter productif to have to decide a maxi=
mum memory amount beforehand. if we do this, will we have to set maximum CP=
U cores also in the future (being devil's advocate here ;) )=20
BQ_END
You don=E2=80=99t have to decide, you can keep the default 4x.=20
For CPUs it is not currently needed and is set according to engine-config m=
aximum supported by qemu-kvm - 288 in 4.1=20
Thanks,=20
michal=20
.=20
BQ_BEGIN
I did searched oVirt documentation, but very little information is availabl=
e.=20
Maybe this is an libvirt question, but I'm hopping a oVirt guru could quick=
ly enlighten me.=20
cordialement, regards,=20
<element-signature_logo_lyra_115x94.jpg>=20
=09Nelson LAMEIRAS=20
Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux / Systems and Networks enginee=
r=20
Tel: +33 5 32 09 09 70=20
nelson.lameiras(a)lyra-network.com=20
www.lyra-network.com |
www.payzen.eu=20
<element-signature_logo_YouTube_32x28.jpg>=20
=09<element-signature_logo_LinkedIn_41x28.jpg>=20
=09<element-signature_logo_Twitter_42x28.jpg>=20
=09<element-signature_payzen_61x28.jpg>=20
Lyra Network, 109 rue de l'innovation, 31670 Lab=C3=A8ge, FRANCE=20
_______________________________________________=20
Users mailing list=20
Users(a)ovirt.org=20
http://lists.ovirt.org/mailman/listinfo/users=20
BQ_END
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<html><body><div style=3D"font-family: arial, helvetica, sans-serif;
font-s=
ize: 12pt; color: #000000"><div>Hello
michal,<br></div><div><br data-mce-bo=
gus=3D"1"></div><div>Thanks for your answers.<br
data-mce-bogus=3D"1"></div=
<div>If others have same questions, I did found this information
below on =
oVirt web site
(
http://www.ovirt.org/develop/release-management/features/en=
gine/maximum-memory-size/)</div><div><h2
id=3D"note-on-size-of-maximum-memo=
ry" style=3D"box-sizing: border-box; font-family: 'Venturis Sans',
'Venturi=
s Sans Adf', VenturisSans, 'VenturisSans ADF', sans-serif; font-weight: 500=
; line-height: 1.1; color: #333333; margin-top: 17pt; margin-bottom: 8.5pt;=
font-size: 25pt; font-style: normal; font-variant-ligatures: normal; font-=
variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start=
; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; w=
ord-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff=
; text-decoration-style: initial; text-decoration-color: initial;" data-mce=
-style=3D"box-sizing: border-box; font-family: 'Venturis Sans', 'Venturis
S=
ans Adf', VenturisSans, 'VenturisSans ADF', sans-serif; font-weight: 500; l=
ine-height: 1.1; color: #333333; margin-top: 17pt; margin-bottom: 8.5pt; fo=
nt-size: 25pt; font-style: normal; font-variant-ligatures: normal; font-var=
iant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; t=
ext-indent: 0px; text-transform: none; white-space: normal; widows: 2; word=
-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; t=
ext-decoration-style: initial; text-decoration-color: initial;">Note on siz=
e of maximum memory</h2><p style=3D"box-sizing: border-box; margin: 0px;
co=
lor: #333333; font-family: 'Source Sans Pro','Open Sans','Helvetica
Neue',H=
elvetica,Arial,sans-serif; font-size: 16px; font-style: normal; font-varian=
t-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; text-align: start; text-indent: 0px; text-transform: none=
; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; b=
ackground-color: #ffffff; text-decoration-style: initial; text-decoration-c=
olor: initial;" data-mce-style=3D"box-sizing: border-box; margin: 0px; colo=
r: #333333; font-family: 'Source Sans Pro','Open Sans','Helvetica
Neue',Hel=
vetica,Arial,sans-serif; font-size: 16px; font-style: normal; font-variant-=
ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-s=
pacing: normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; bac=
kground-color: #ffffff; text-decoration-style: initial; text-decoration-col=
or: initial;">If memory hot-plug is not required, max memory can be set to =
be the same as VM memory. Suggested value is 4x size of VM memory. Larger m=
ax memory is discouraged because:</p><ul style=3D"box-sizing: border-box;
m=
argin-top: 0px; margin-bottom: 8.5pt; color: #333333; font-family: 'Source =
Sans Pro', 'Open Sans', 'Helvetica Neue', Helvetica, Arial,
sans-serif; fon=
t-size: 16px; font-style: normal; font-variant-ligatures: normal; font-vari=
ant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; =
text-align: start; text-indent: 0px; text-transform: none; white-space: nor=
mal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; backgrou=
nd-color: #ffffff; text-decoration-style: initial; text-decoration-color: i=
nitial;" data-mce-style=3D"box-sizing: border-box; margin-top: 0px; margin-=
bottom: 8.5pt; color: #333333; font-family: 'Source Sans Pro', 'Open
Sans',=
'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; font-styl=
e: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-=
weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text=
-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text=
-decoration-style: initial; text-decoration-color: initial;"><li
style=3D"b=
ox-sizing: border-box;" data-mce-style=3D"box-sizing: border-box;">I can
ma=
ke QEMU process to start for longer time.</li><li style=3D"box-sizing:
bord=
er-box;" data-mce-style=3D"box-sizing: border-box;">If hot plugged
memory i=
s also required to be hot unpluggable, it needs to be considered as <em sty=
le=3D"box-sizing: border-box;" data-mce-style=3D"box-sizing:
border-box;">m=
ovable</em> by the guest kernel. Kernel requires the amount of movable memo=
ry to be at most 4x larger that non-movable memory for stable run.</li><li =
style=3D"box-sizing: border-box;" data-mce-style=3D"box-sizing:
border-box;=
">On PowerPC platform continuous block of non-movable memory of size 1/64 o=
f the max memory needs to be allocated for each
VM.</li></ul></div><div><br=
</div><div
data-marker=3D"__SIG_PRE__"><div>cordialement,
regards,</div><d=
iv><br
data-mce-bogus=3D"1"></div><table style=3D"margin: 0px;
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font-family: Arial,sa=
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le=3D"margin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b=
3c7a; line-height: 16px; width: 258.75pt;" width=3D"345"
valign=3D"top"><ta=
ble style=3D"margin: 0; width: 258.75pt; table-layout: fixed; border: none;=
" data-mce-style=3D"margin: 0; width: 258.75pt; table-layout: fixed; border=
: none;" width=3D"345" cellspacing=3D"0"
cellpadding=3D"0" border=3D"0"><tb=
ody><tr><td style=3D"font-size: 16px; font-family: Arial,sans-serif;
color:=
#2b3c7a; line-height: 18px; font-weight: bold;" data-mce-style=3D"font-siz=
e: 16px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 18px; =
font-weight: bold;">Nelson LAMEIRAS</td></tr><tr><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: 11p=
x; line-height: 16px;">Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux<span st=
yle=3D"font-family: Arial,sans-serif; color: #337ab7; font-size: 11px;" dat=
a-mce-style=3D"font-family: Arial,sans-serif; color: #337ab7; font-size: 11=
px;"> / Systems and Networks
engineer</span></td></tr><tr><td style=3D"line=
-height: 16px; font-family: 'Arial',sans-serif; color: #2b3c7a; font-size: =
11px;" data-mce-style=3D"line-height: 16px; font-family:
'Arial',sans-serif=
; color: #2b3c7a; font-size: 11px;"><span style=3D"font-family:
Arial,sans-=
serif; color: #2b3c7a; font-size: 11px;" data-mce-style=3D"font-family: Ari=
al,sans-serif; color: #2b3c7a; font-size: 11px;">Tel: +33 5 32 09 09 70</sp=
an></td></tr><tr><td style=3D"line-height: 16px; font-family:
'Arial',sans-=
serif; color: #2b3c7a; font-size: 11px;" data-mce-style=3D"line-height: 16p=
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data-mce-style=3D"fo=
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data-mce-bogus=3D"1">=
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le=3D"margin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b=
3c7a; line-height: 16px; width: 30.75pt; text-align: left;"><div>Lyra
Netwo=
rk, 109 rue de l'innovation, 31670 Lab=C3=A8ge,
FRANCE</div></td></tr></tbo=
dy></table><div><br></div></div><div><br></div><hr
id=3D"zwchr" data-marker=
=3D"__DIVIDER__"><div
data-marker=3D"__HEADERS__"><b>From: </b>"Michal Skri=
vanek" &lt;michal.skrivanek(a)redhat.com&gt;<br><b>To:
</b>"Nelson Lameiras" =
&lt;nelson.lameiras(a)lyra-network.com&gt;<br><b>Cc:
</b>"ovirt users" <us=
ers(a)ovirt.org&gt;<br><b>Sent: </b>Tuesday, April 18, 2017 11:55:46
AM<br><b=
Subject: </b>Re: [ovirt-users] vm "maximum memory"
setting questions<br></=
div><div><br></div><div
data-marker=3D"__QUOTED_TEXT__"><br class=3D""><div=
<blockquote class=3D""><div
class=3D"">On 18 Apr 2017, at 11:46, Nelson La=
meiras <<a
href=3D"mailto:nelson.lameiras@lyra-network.com" class=3D"" t=
arget=3D"_blank">nelson.lameiras(a)lyra-network.com</a>&gt;
wrote:</div><br c=
lass=3D"Apple-interchange-newline"><div class=3D""><div
class=3D""><div sty=
le=3D"font-family: arial, helvetica, sans-serif; font-size: 12pt;" class=3D=
""><div class=3D"">Hello,<br
class=3D""></div><div class=3D""><br
class=3D"=
"></div><div class=3D"">A new vm setting "maximum
memory" has appeared in o=
Virt >4 which by default has the value "current memory=E2=80=9D*4<br cla=
ss=3D""></div></div></div></div></blockquote><div><br
class=3D""></div>In 4=
.1</div><div><br class=3D""><blockquote
class=3D""><div class=3D""><div cla=
ss=3D""><div style=3D"font-family: arial, helvetica, sans-serif;
font-size:=
12pt;" class=3D""><div class=3D""><br
class=3D""></div><div class=3D"">- W=
hy is "maximum memory" setting necessary to
set?</div></div></div></div></b=
lockquote></div><div><blockquote 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 def=
ault ?</div></div></div></div></blockquote><div><br
class=3D""></div><div>B=
ecause it=E2=80=99s recommended to be about 4x the startup size by linux ke=
rnel</div><div class=3D""><br
class=3D""></div><blockquote class=3D""><div =
class=3D""><div class=3D""><div style=3D"font-family:
arial, helvetica, san=
s-serif; font-size: 12pt;" class=3D""><div
class=3D""><br 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 t=
o set maximum CPU cores also in the future (being devil's advocate here ;) =
)<br
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><di=
v>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 class=
=3D""><div class=3D""><div class=3D""><div
style=3D"font-family: arial, hel=
vetica, sans-serif; font-size: 12pt;" class=3D""><div
class=3D""><br class=
=3D""></div><div class=3D""><div
class=3D"">I did searched oVirt documentat=
ion, but very little information is available.</div><div
class=3D"">Maybe t=
his is an libvirt question, but I'm hopping a oVirt guru could quickly enli=
ghten me.<br class=3D""></div></div><div
class=3D""><br class=3D""></div><d=
iv class=3D""><div class=3D"">cordialement,
regards,</div><div class=3D""><=
br class=3D""></div><table style=3D"margin: 0px; table-layout:
fixed; borde=
r: none; width: 345pt; padding: 0px;" width=3D"460"
cellspacing=3D"0" cellp=
adding=3D"0" border=3D"0"><tbody class=3D""><tr
class=3D""><td style=3D"mar=
gin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; lin=
e-height: 16px; width: 86.25pt; text-align: left;" class=3D""
width=3D"115"=
valign=3D"top"><a
href=3D"https://www.lyra-network.com/"
style=3D"border: =
none; text-decoration: none; width: 100%; display: block; clear: both;" cla=
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r class=3D""></td><td style=3D"margin: 0; font-size: 11px;
font-family: Ari=
al,sans-serif; color: #2b3c7a; line-height: 16px; width: 258.75pt;" class=
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style=3D"margin: 0; width: 258.75=
pt; table-layout: fixed; border: none;" width=3D"345"
cellspacing=3D"0" cel=
lpadding=3D"0" border=3D"0"><tbody
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ont-size: 16px; font-family: Arial,sans-serif; color: #2b3c7a; line-height:=
18px; font-weight: bold;" class=3D"">Nelson
LAMEIRAS</td></tr><tr class=3D=
""><td style=3D"font-family: Arial,sans-serif; color: #2b3c7a;
font-size: 1=
1px; line-height: 16px;" class=3D"">Ing=C3=A9nieur Syst=C3=A8mes et
R=C3=A9=
seaux<span style=3D"font-family: Arial,sans-serif; color: #337ab7; font-siz=
e: 11px;" class=3D""> / Systems and Networks
engineer</span></td></tr><tr c=
lass=3D""><td style=3D"line-height: 16px; font-family:
'Arial',sans-serif; =
color: #2b3c7a; font-size: 11px;" class=3D""><span
style=3D"font-family: Ar=
ial,sans-serif; color: #2b3c7a; font-size: 11px;" class=3D"">Tel: +33 5
32 =
09 09 70</span></td></tr><tr class=3D""><td
style=3D"line-height: 16px; fon=
t-family: 'Arial',sans-serif; color: #2b3c7a; font-size: 11px;"
class=3D"">=
<a href=3D"mailto:nelson.lameiras@lyra-network.com" style=3D"font-size:
11p=
x; font-family: Arial,sans-serif; line-height: 16px; text-decoration: none;=
" class=3D""
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ht: 16px; border: none; text-decoration: none;" class=3D""
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"> |
www.payzen.eu</a><br
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tbody></table><table style=3D"margin: 0; table-layout: fixed; border:
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ly: Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 30.75pt; te=
xt-align: left;" class=3D""><div class=3D"">Lyra
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class=3D""></div></div></div></div>______________________________=
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