[pve-devel] Error in PVE with win2008r2 and 256GB RAM

[Alexandre DERUMIER]

Note that currently,

hugepages are managed with transparent hugepage mecanism.

But it's seem that we can defined manually hugepages by numa nodes

-object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=1024M,id=ram-node0 -numa node,nodeid=0,cpus=0,memdev=ram-node0
-object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=1024M,id=ram-node1 -numa node,nodeid=1,cpus=1,memdev=ram-node1


I'll try to make a patch if you want to test.


----- Mail original -----
De: "aderumier" <aderumier at odiso.com>
À: "Cesar Peschiera" <brain at click.com.py>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Jeudi 18 Décembre 2014 06:15:44
Objet: Re: [pve-devel] Error in PVE with win2008r2 and 256GB RAM

>>Moreover, i guess that i have problems of Hugapages. 

I have found interesting blog: 

http://developerblog.redhat.com/2014/03/10/examining-huge-pages-or-transparent-huge-pages-performance/ 

It's explain how to see if hugepage impact performance or not. 



----- Mail original ----- 
De: "Cesar Peschiera" <brain at click.com.py> 
À: "aderumier" <aderumier at odiso.com>, "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Jeudi 18 Décembre 2014 03:44:33 
Objet: Re: [pve-devel] Error in PVE with win2008r2 and 256GB RAM 

Hi Alexandre 

I have installed your patches and with some test of MS-SQL-Server, i see a 
better behavior in terms of speed (soon i will give the comparisons). 

Moreover, i guess that i have problems of Hugapages. 
Please see this link, and answer me if you can: 
http://forum.proxmox.com/threads/20449-Win2008R2-exaggeratedly-slow-with-256GB-RAM-and-strange-behaviours-in-PVE?p=104996#post104996 


----- Original Message ----- 
From: "Alexandre DERUMIER" <aderumier at odiso.com> 
To: "Cesar Peschiera" <brain at click.com.py> 
Cc: <pve-devel at pve.proxmox.com> 
Sent: Tuesday, December 02, 2014 9:50 AM 
Subject: Re: [pve-devel] Error in PVE with win2008r2 and 256GB RAM 


Hi, 
can you test this: 

http://odisoweb1.odiso.net/pve-qemu-kvm_2.2-2_amd64.deb 
http://odisoweb1.odiso.net/qemu-server_3.3-5_amd64.deb 


then edit your vm config file: 


sockets: 2 
cores: 4 
memory: 262144 
numa0: memory=131072,policy=bind 
numa1: memory=131072,policy=bind 


(you need 1 numa by socket, total numa memory must be equal to vm memory). 

you can change cores number if you want. 


and start the vm ? 


----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Cesar Peschiera" <brain at click.com.py> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mardi 2 Décembre 2014 12:40:29 
Objet: Re: [pve-devel] Error in PVE with win2008r2 and 256GB RAM 

Hi, 

some news. 

It's seem that current proxmox qemu build don't have numa support enable. 

So, previous command line don't work. 


I'll send a patch for pve-qemu-kvm and also to add numa options to vm config 
file. 



----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Cesar Peschiera" <brain at click.com.py> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mardi 2 Décembre 2014 07:05:47 
Objet: Re: [pve-devel] Error in PVE with win2008r2 and 256GB RAM 

>>at i would like to ask you if you can give me your suggestions in 
>>practical terms, besides the brief theoretical explanation, this is due to 
>>that i am not a developer and i don't understand as apply it in my PVE. 

About the command line, each vm is a kvm process. 

So start your vm with current config, do a "ps -aux" , copy the big "kvm -id 
... " command line for your vm, 

stop the vm. 

then, 

add my specials lines about numa, 

and paste the command line to start the vm ! 


(kvm is so simple ;) 


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