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I had the same issue and this command helped me, thanks.

Thanks for all, I think problem is solved, waiting for new kernel 3.10 in stable.

Found some information about this here http://forum.proxmox.com/threads/11384-Enable-or-Disable-Hyperthreading

When I lost hope for positie solution, i decided to make several VMs with smallest performance. For tests to current (problem) VM i attached 8 cores 1 socet, and ..... BINGO! But question is open, what mean socet in proxmox VM configuration, is it equal to thread on host server, and VM with...

Please in details. With hyperthreading i have 16 cores (8 cores 2 socets), i attached 7 cores 2 socets (14 vcpus) to VM, there is only one VM on this host - is it quite high?

Server is in production, therefore i can't use test repository

One more terrible day... I disabled "use tablet for pointer", deleted all NICs with drivers, attached new NIC, installed virtio drivers for new NIC - still low performance. Changed cache type to writeback - still low performance. Please help)

1) I don't see any USB options in hardware tab do you mean "use tablet for pointer" in options tab? This option needs to poweroff-poweron server? 2) Is there any reason to increase CPU units, if there will be only one VM on host?

Hi. Thanks for help. I upgraded proxmox: proxmox-ve-2.6.32: 3.3-139 (running kernel: 2.6.32-34-pve) pve-manager: 3.3-5 (running version: 3.3-5/bfebec03) pve-kernel-2.6.32-34-pve: 2.6.32-140 pve-kernel-2.6.32-26-pve: 2.6.32-114 lvm2: 2.02.98-pve4 clvm: 2.02.98-pve4 corosync-pve: 1.4.7-1...

Thanks for fast reply, but I have fixed memory:(.

Hi. We have windows 2012 r2 Standart installed on proxmox pveversion --verbose proxmox-ve-2.6.32: 3.1-114 (running kernel: 2.6.32-26-pve) pve-manager: 3.1-21 (running version: 3.1-21/93bf03d4) pve-kernel-2.6.32-26-pve: 2.6.32-114 lvm2: 2.02.98-pve4 clvm: 2.02.98-pve4 corosync-pve: 1.4.5-1...