Are there any documents going more deep= l=3D y in these sort of considerations?

This is exactly what I have been searching f= o=3D r lately, too. Please let me know if you find anything (or blog posts= ,=3D forums, books, etc). Thank you!

Sent from my mobile phone

On 6 Sep 2017, at 12:47, Gianluca Cecchi <gianluca.cecchi(a)gmail.com> wrote:

Hello,
I was talk= ing w=3D ith a guy expert in VMware and discussing performance of VMs in respect of = v=3D irtual cpus assigned to them in relation with mapping with the real hw of t= h=3D e hypervisor underneath.

One of the topics was num= a=3D usage and its overheads in case of a "too" big VM, in terms of both number= o=3D f vcpus and memory amount.
Eg:
suppose host has 2= i=3D ntel based sockets, with 6 cores and HT enabled and has 96Gb of ram (distri= b=3D uted 48+48 between the 2 processors)
suppose I configure a VM wit= h=3D 16 vcpus (2:4:2): would be the mapping respected at physical level or only= a=3D sort of "hint" for the hypervisor?
Can I say that it would perfo= r=3D m better if I configure it 12 vcpus and mapping 1:6:2, because it can stay = a=3D ll inside one cpu?

And what if I define a VM with = 5=3D 2Gb of ram? Can I say that it would perform in general better if I try to g= e=3D t it all in one cpu related memory slots (eg not more than 48Gb in my examp= l=3D e)?

Are there any documents going more deeply in t= h=3D ese sort of considerations?

Also, if one goes and = s=3D izes so that the biggest VM is able to all-stay inside one cpu-memory, does= i=3D t make sense to say that it will perform better in this scenario a cluster = c=3D omposed by 4 nodes, each one with 1 socket and 48Gb of memory instead of a = c=3D luster of 2 nodes, each one with 2 sockets and 96Gb of ram?

<= /=3D div>
Hope I have clarified my questions/doubts.

Thanks in advance for any insight,
Gianluca = ;=3D

_________________= ___=3D ___________________________
Users mailing list
Users(a)ovirt.org
<= span>http://lists.ovir= t.o=3D rg/mailman/listinfo/users

=3D --Apple-Mail-FC5CF2F4-77D9-4AB3-AECA-43D5365F3844-- --===============3590075039898081528== Content-Type: multipart/alternative MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="attachment.bin" Ci0tQXBwbGUtTWFpbC1GQzVDRjJGNC03N0Q5LTRBQjMtQUVDQS00M0Q1MzY1RjM4NDQKQ29udGVu dC1UeXBlOiB0ZXh0L3BsYWluOwoJY2hhcnNldD11cy1hc2NpaQpDb250ZW50LVRyYW5zZmVyLUVu Y29kaW5nOiBxdW90ZWQtcHJpbnRhYmxlCgo+IEFyZSB0aGVyZSBhbnkgZG9jdW1lbnRzIGdvaW5n IG1vcmUgZGVlcGx5IGluIHRoZXNlIHNvcnQgb2YgY29uc2lkZXJhdGlvbnM/PQoKClRoaXMgaXMg ZXhhY3RseSB3aGF0IEkgaGF2ZSBiZWVuIHNlYXJjaGluZyBmb3IgbGF0ZWx5LCB0b28uICBQbGVh c2UgbGV0IG1lIGs9Cm5vdyBpZiB5b3UgZmluZCBhbnl0aGluZyAob3IgYmxvZyBwb3N0cywgZm9y dW1zLCBib29rcywgZXRjKS4gIFRoYW5rIHlvdSEKClNlbnQgZnJvbSBteSBtb2JpbGUgcGhvbmUK Cj4gT24gNiBTZXAgMjAxNywgYXQgMTI6NDcsIEdpYW5sdWNhIENlY2NoaSA8Z2lhbmx1Y2EuY2Vj Y2hpQGdtYWlsLmNvbT4gd3JvdGU9CjoKPj0yMAo+IEhlbGxvLAo+IEkgd2FzIHRhbGtpbmcgd2l0 aCBhIGd1eSBleHBlcnQgaW4gVk13YXJlIGFuZCBkaXNjdXNzaW5nIHBlcmZvcm1hbmNlIG9mIFZN PQpzIGluIHJlc3BlY3Qgb2YgdmlydHVhbCBjcHVzIGFzc2lnbmVkIHRvIHRoZW0gaW4gcmVsYXRp b24gd2l0aCBtYXBwaW5nIHdpdGggdD0KaGUgcmVhbCBodyBvZiB0aGUgaHlwZXJ2aXNvciB1bmRl cm5lYXRoLgo+PTIwCj4gT25lIG9mIHRoZSB0b3BpY3Mgd2FzIG51bWEgdXNhZ2UgYW5kIGl0cyBv dmVyaGVhZHMgaW4gY2FzZSBvZiBhICJ0b28iIGJpZyBWPQpNLCBpbiB0ZXJtcyBvZiBib3RoIG51 bWJlciBvZiB2Y3B1cyBhbmQgbWVtb3J5IGFtb3VudC4KPiBFZzo9MjAKPiBzdXBwb3NlIGhvc3Qg aGFzIDIgaW50ZWwgYmFzZWQgc29ja2V0cywgd2l0aCA2IGNvcmVzIGFuZCBIVCBlbmFibGVkIGFu ZCBoYT0KcyA5NkdiIG9mIHJhbSAoZGlzdHJpYnV0ZWQgNDgrNDggYmV0d2VlbiB0aGUgMiBwcm9j ZXNzb3JzKQo+IHN1cHBvc2UgSSBjb25maWd1cmUgYSBWTSB3aXRoIDE2IHZjcHVzICgyOjQ6Mik6 IHdvdWxkIGJlIHRoZSBtYXBwaW5nIHJlc3BlPQpjdGVkIGF0IHBoeXNpY2FsIGxldmVsIG9yIG9u bHkgYSBzb3J0IG9mICJoaW50IiBmb3IgdGhlIGh5cGVydmlzb3I/Cj4gQ2FuIEkgc2F5IHRoYXQg aXQgd291bGQgcGVyZm9ybSBiZXR0ZXIgaWYgSSBjb25maWd1cmUgaXQgMTIgdmNwdXMgYW5kIG1h cHA9CmluZyAxOjY6MiwgYmVjYXVzZSBpdCBjYW4gc3RheSBhbGwgaW5zaWRlIG9uZSBjcHU/Cj49 MjAKPiBBbmQgd2hhdCBpZiBJIGRlZmluZSBhIFZNIHdpdGggNTJHYiBvZiByYW0/IENhbiBJIHNh eSB0aGF0IGl0IHdvdWxkIHBlcmZvcj0KbSBpbiBnZW5lcmFsIGJldHRlciBpZiBJIHRyeSB0byBn ZXQgaXQgYWxsIGluIG9uZSBjcHUgcmVsYXRlZCBtZW1vcnkgc2xvdHMgKD0KZWcgbm90IG1vcmUg dGhhbiA0OEdiIGluIG15IGV4YW1wbGUpPwo+PTIwCj4gQXJlIHRoZXJlIGFueSBkb2N1bWVudHMg Z29pbmcgbW9yZSBkZWVwbHkgaW4gdGhlc2Ugc29ydCBvZiBjb25zaWRlcmF0aW9ucz89Cgo+PTIw Cj4gQWxzbywgaWYgb25lIGdvZXMgYW5kIHNpemVzIHNvIHRoYXQgdGhlIGJpZ2dlc3QgVk0gaXMg YWJsZSB0byBhbGwtc3RheSBpbnM9CmlkZSBvbmUgY3B1LW1lbW9yeSwgZG9lcyBpdCBtYWtlIHNl bnNlIHRvIHNheSB0aGF0IGl0IHdpbGwgcGVyZm9ybSBiZXR0ZXIgaW49CiB0aGlzIHNjZW5hcmlv IGEgY2x1c3RlciBjb21wb3NlZCBieSA0IG5vZGVzLCBlYWNoIG9uZSB3aXRoIDEgc29ja2V0IGFu ZCA0OEc9CmIgb2YgbWVtb3J5IGluc3RlYWQgb2YgYSBjbHVzdGVyIG9mIDIgbm9kZXMsIGVhY2gg b25lIHdpdGggMiBzb2NrZXRzIGFuZCA5Nkc9CmIgb2YgcmFtPwo+PTIwCj4gSG9wZSBJIGhhdmUg Y2xhcmlmaWVkIG15IHF1ZXN0aW9ucy9kb3VidHMuCj49MjAKPj0yMAo+IFRoYW5rcyBpbiBhZHZh bmNlIGZvciBhbnkgaW5zaWdodCwKPiBHaWFubHVjYSA9MjAKPiBfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwo+IFVzZXJzIG1haWxpbmcgbGlzdAo+IFVzZXJz QG92aXJ0Lm9yZwo+IGh0dHA6Ly9saXN0cy5vdmlydC5vcmcvbWFpbG1hbi9saXN0aW5mby91c2Vy cwoKLS1BcHBsZS1NYWlsLUZDNUNGMkY0LTc3RDktNEFCMy1BRUNBLTQzRDUzNjVGMzg0NApDb250 ZW50LVR5cGU6IHRleHQvaHRtbDsKCWNoYXJzZXQ9dXRmLTgKQ29udGVudC1UcmFuc2Zlci1FbmNv ZGluZzogcXVvdGVkLXByaW50YWJsZQoKPGh0bWw+PGhlYWQ+PG1ldGEgaHR0cC1lcXVpdj0zRCJj b250ZW50LXR5cGUiIGNvbnRlbnQ9M0QidGV4dC9odG1sOyBjaGFyc2V0PTNEPQp1dGYtOCI+PC9o ZWFkPjxib2R5IGRpcj0zRCJhdXRvIj48ZGl2PjxzcGFuPjwvc3Bhbj48L2Rpdj48ZGl2PjxtZXRh IGh0dHAtZXF1PQppdj0zRCJjb250ZW50LXR5cGUiIGNvbnRlbnQ9M0QidGV4dC9odG1sOyBjaGFy c2V0PTNEdXRmLTgiPjxkaXY+PGJsb2NrcXVvdGUgdD0KeXBlPTNEImNpdGUiPjxkaXYgZGlyPTNE Imx0ciI+PGZvbnQgY29sb3I9M0QiIzAwMDAwMCI+PHNwYW4gc3R5bGU9M0QiYmFja2dybz0KdW5k LWNvbG9yOiByZ2JhKDI1NSwgMjU1LCAyNTUsIDApOyI+QXJlIHRoZXJlIGFueSBkb2N1bWVudHMg Z29pbmcgbW9yZSBkZWVwbD0KeSBpbiB0aGVzZSBzb3J0IG9mIGNvbnNpZGVyYXRpb25zPzwvc3Bh bj48L2ZvbnQ+PC9kaXY+PC9ibG9ja3F1b3RlPjxkaXYgaWQ9M0Q9CiJBcHBsZU1haWxTaWduYXR1 cmUiPjxicj48L2Rpdj5UaGlzIGlzIGV4YWN0bHkgd2hhdCBJIGhhdmUgYmVlbiBzZWFyY2hpbmcg Zm89CnIgbGF0ZWx5LCB0b28uICZuYnNwO1BsZWFzZSBsZXQgbWUga25vdyBpZiB5b3UgZmluZCBh bnl0aGluZyAob3IgYmxvZyBwb3N0cyw9CiBmb3J1bXMsIGJvb2tzLCBldGMpLiAmbmJzcDtUaGFu ayB5b3UhPGJyPjxicj5TZW50IGZyb20gbXkgbW9iaWxlIHBob25lPC9kaXY9Cj48ZGl2Pjxicj5P biA2IFNlcCAyMDE3LCBhdCAxMjo0NywgR2lhbmx1Y2EgQ2VjY2hpICZsdDs8YSBocmVmPTNEIm1h aWx0bzpnaWE9Cm5sdWNhLmNlY2NoaUBnbWFpbC5jb20iPmdpYW5sdWNhLmNlY2NoaUBnbWFpbC5j b208L2E+Jmd0OyB3cm90ZTo8YnI+PGJyPjwvZGk9CnY+PGJsb2NrcXVvdGUgdHlwZT0zRCJjaXRl Ij48ZGl2PjxkaXYgZGlyPTNEImx0ciI+SGVsbG8sPGRpdj5JIHdhcyB0YWxraW5nIHc9Cml0aCBh IGd1eSBleHBlcnQgaW4gVk13YXJlIGFuZCBkaXNjdXNzaW5nIHBlcmZvcm1hbmNlIG9mIFZNcyBp biByZXNwZWN0IG9mIHY9CmlydHVhbCBjcHVzIGFzc2lnbmVkIHRvIHRoZW0gaW4gcmVsYXRpb24g d2l0aCBtYXBwaW5nIHdpdGggdGhlIHJlYWwgaHcgb2YgdGg9CmUgaHlwZXJ2aXNvciB1bmRlcm5l YXRoLjwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+T25lIG9mIHRoZSB0b3BpY3Mgd2FzIG51bWE9 CiB1c2FnZSBhbmQgaXRzIG92ZXJoZWFkcyBpbiBjYXNlIG9mIGEgInRvbyIgYmlnIFZNLCBpbiB0 ZXJtcyBvZiBib3RoIG51bWJlciBvPQpmIHZjcHVzIGFuZCBtZW1vcnkgYW1vdW50LjwvZGl2Pjxk aXY+RWc6Jm5ic3A7PC9kaXY+PGRpdj5zdXBwb3NlIGhvc3QgaGFzIDIgaT0KbnRlbCBiYXNlZCBz b2NrZXRzLCB3aXRoIDYgY29yZXMgYW5kIEhUIGVuYWJsZWQgYW5kIGhhcyA5NkdiIG9mIHJhbSAo ZGlzdHJpYj0KdXRlZCA0OCs0OCBiZXR3ZWVuIHRoZSAyIHByb2Nlc3NvcnMpPC9kaXY+PGRpdj5z dXBwb3NlIEkgY29uZmlndXJlIGEgVk0gd2l0aD0KIDE2IHZjcHVzICgyOjQ6Mik6IHdvdWxkIGJl IHRoZSBtYXBwaW5nIHJlc3BlY3RlZCBhdCBwaHlzaWNhbCBsZXZlbCBvciBvbmx5IGE9CiBzb3J0 IG9mICJoaW50IiBmb3IgdGhlIGh5cGVydmlzb3I/PC9kaXY+PGRpdj5DYW4gSSBzYXkgdGhhdCBp dCB3b3VsZCBwZXJmb3I9Cm0gYmV0dGVyIGlmIEkgY29uZmlndXJlIGl0IDEyIHZjcHVzIGFuZCBt YXBwaW5nIDE6NjoyLCBiZWNhdXNlIGl0IGNhbiBzdGF5IGE9CmxsIGluc2lkZSBvbmUgY3B1Pzwv ZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+QW5kIHdoYXQgaWYgSSBkZWZpbmUgYSBWTSB3aXRoIDU9 CjJHYiBvZiByYW0/IENhbiBJIHNheSB0aGF0IGl0IHdvdWxkIHBlcmZvcm0gaW4gZ2VuZXJhbCBi ZXR0ZXIgaWYgSSB0cnkgdG8gZ2U9CnQgaXQgYWxsIGluIG9uZSBjcHUgcmVsYXRlZCBtZW1vcnkg c2xvdHMgKGVnIG5vdCBtb3JlIHRoYW4gNDhHYiBpbiBteSBleGFtcGw9CmUpPzwvZGl2PjxkaXY+ PGJyPjwvZGl2PjxkaXY+QXJlIHRoZXJlIGFueSBkb2N1bWVudHMgZ29pbmcgbW9yZSBkZWVwbHkg aW4gdGg9CmVzZSBzb3J0IG9mIGNvbnNpZGVyYXRpb25zPzwvZGl2PjxkaXY+PGJyPjwvZGl2Pjxk aXY+QWxzbywgaWYgb25lIGdvZXMgYW5kIHM9Cml6ZXMgc28gdGhhdCB0aGUgYmlnZ2VzdCBWTSBp cyBhYmxlIHRvIGFsbC1zdGF5IGluc2lkZSBvbmUgY3B1LW1lbW9yeSwgZG9lcyBpPQp0IG1ha2Ug c2Vuc2UgdG8gc2F5IHRoYXQgaXQgd2lsbCBwZXJmb3JtIGJldHRlciBpbiB0aGlzIHNjZW5hcmlv IGEgY2x1c3RlciBjPQpvbXBvc2VkIGJ5IDQgbm9kZXMsIGVhY2ggb25lIHdpdGggMSBzb2NrZXQg YW5kIDQ4R2Igb2YgbWVtb3J5IGluc3RlYWQgb2YgYSBjPQpsdXN0ZXIgb2YgMiBub2RlcywgZWFj aCBvbmUgd2l0aCAyIHNvY2tldHMgYW5kIDk2R2Igb2YgcmFtPzwvZGl2PjxkaXY+PGJyPjwvPQpk aXY+PGRpdj5Ib3BlIEkgaGF2ZSBjbGFyaWZpZWQgbXkgcXVlc3Rpb25zL2RvdWJ0cy48L2Rpdj48 ZGl2Pjxicj48L2Rpdj48ZGl2PQo+PGJyPjwvZGl2PjxkaXY+VGhhbmtzIGluIGFkdmFuY2UgZm9y IGFueSBpbnNpZ2h0LDwvZGl2PjxkaXY+R2lhbmx1Y2EgJm5ic3A7PQo8L2Rpdj48L2Rpdj4KPC9k aXY+PC9ibG9ja3F1b3RlPjxibG9ja3F1b3RlIHR5cGU9M0QiY2l0ZSI+PGRpdj48c3Bhbj5fX19f X19fX19fX19fX19fX19fXz0KX19fX19fX19fX19fX19fX19fX19fX19fX19fPC9zcGFuPjxicj48 c3Bhbj5Vc2VycyBtYWlsaW5nIGxpc3Q8L3NwYW4+PGJyPjxzcD0KYW4+PGEgaHJlZj0zRCJtYWls dG86VXNlcnNAb3ZpcnQub3JnIj5Vc2Vyc0BvdmlydC5vcmc8L2E+PC9zcGFuPjxicj48c3Bhbj48 YT0KIGhyZWY9M0QiaHR0cDovL2xpc3RzLm92aXJ0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3VzZXJz Ij5odHRwOi8vbGlzdHMub3ZpcnQubz0KcmcvbWFpbG1hbi9saXN0aW5mby91c2VyczwvYT48L3Nw YW4+PGJyPjwvZGl2PjwvYmxvY2txdW90ZT48L2Rpdj48L2JvZHk+PC9odD0KbWw+PQoKLS1BcHBs ZS1NYWlsLUZDNUNGMkY0LTc3RDktNEFCMy1BRUNBLTQzRDUzNjVGMzg0NC0tCg== --===============3590075039898081528==--