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On 18 Apr 2017, at 11:46, Nelson Lameiras = <nelson.lameiras@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@lyra-network.com = <mailto:nelson.lameiras@lyra-network.com> www.lyra-network.com <https://www.lyra-network.com/> | www.payzen.eu = <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 _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
--Apple-Mail=_D8E6B794-A46C-4E04-B137-7522A89923D6 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <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@lyra-network.com</a>> 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" = class=3D""></div><table style=3D"margin: 0px; table-layout: fixed; = border: none; width: 345pt; padding: 0px;" data-mce-style=3D"margin: = 0px; table-layout: fixed; border: none; width: 345pt; padding: 0px;" = width=3D"460" cellspacing=3D"0" cellpadding=3D"0" border=3D"0" = class=3D""><tbody class=3D""><tr class=3D""><td style=3D"margin: 0; = font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; = line-height: 16px; width: 86.25pt; text-align: left;" = data-mce-style=3D"margin: 0; font-size: 11px; font-family: = Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 86.25pt; = text-align: left;" width=3D"115" valign=3D"top" class=3D""><a = href=3D"https://www.lyra-network.com/" style=3D"border: none; = text-decoration: none; width: 100%; display: block; clear: both;" = data-mce-href=3D"https://www.lyra-network.com/" data-mce-style=3D"border: = none; text-decoration: none; width: 100%; display: block; clear: both;" = class=3D""><span = id=3D"cid:b5204ab380be6ea6d0270ae7bfb4f103942609aa@zimbra"><element-sig= nature_logo_lyra_115x94.jpg></span></a><br data-mce-bogus=3D"1" = class=3D""></td><td style=3D"margin: 0; font-size: 11px; font-family: = Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 258.75pt;" = data-mce-style=3D"margin: 0; font-size: 11px; font-family: = Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 258.75pt;" = width=3D"345" valign=3D"top" class=3D""><table 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" class=3D""><tbody class=3D""><tr class=3D""><td = style=3D"font-size: 16px; font-family: Arial,sans-serif; color: #2b3c7a; = line-height: 18px; font-weight: bold;" data-mce-style=3D"font-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: = 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 = style=3D"font-family: Arial,sans-serif; color: #337ab7; font-size: = 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;" = data-mce-style=3D"line-height: 16px; font-family: 'Arial',sans-serif; = color: #2b3c7a; font-size: 11px;" class=3D""><span style=3D"font-family: = Arial,sans-serif; color: #2b3c7a; font-size: 11px;" = data-mce-style=3D"font-family: Arial,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; 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;" class=3D""><a = href=3D"mailto:nelson.lameiras@lyra-network.com" style=3D"font-size: = 11px; font-family: Arial,sans-serif; line-height: 16px; text-decoration: = none;" data-mce-href=3D"mailto:nelson.lameiras@lyra-network.com" = data-mce-style=3D"font-size: 11px; font-family: Arial,sans-serif; = line-height: 16px; text-decoration: none;" = class=3D"">nelson.lameiras@lyra-network.com</a><br data-mce-bogus=3D"1" = class=3D""></td></tr><tr class=3D""><td style=3D"line-height: 16px; 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table-layout: fixed; border: none; width: 345pt;" = data-mce-style=3D"margin: 0; table-layout: fixed; border: none; width: = 345pt;" width=3D"460" cellspacing=3D"0" cellpadding=3D"0" = class=3D""><tbody class=3D""><tr class=3D""><td style=3D"margin: 0; = font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; = line-height: 16px; width: 30.75pt; text-align: left;" = data-mce-style=3D"margin: 0; font-size: 11px; font-family: = Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 30.75pt; = text-align: left;" class=3D""><div class=3D"">Lyra Network, 109 rue de = l'innovation, 31670 Lab=C3=A8ge, = FRANCE</div></td></tr></tbody></table><div class=3D""><br = class=3D""></div></div></div></div>_______________________________________= ________<br class=3D"">Users mailing list<br class=3D""><a = href=3D"mailto:Users@ovirt.org" class=3D"">Users@ovirt.org</a><br = class=3D"">http://lists.ovirt.org/mailman/listinfo/users<br = class=3D""></div></blockquote></div><br class=3D""></body></html>= --Apple-Mail=_D8E6B794-A46C-4E04-B137-7522A89923D6--