Re: Reserve CPU cores for specific guests?
Neil Aggarwal napsal(a): Hello: I don't think there is a way to do this with KVM, but I figured I would ask: I want to be able to offer virtual private servers (VPSs) to clients. I am going to use KVM for it. I would like to offer clients the option to buy either: 1. A VPS which allows CPUs to be overcommitted. 2. A VPS with a dedicated CPU core. So, for example, if I have a six core opteron, I might sell: 2 VPSs with a dedicated CPU core 6 VPSs which allow overcommitted CPUs Since I need one core for the hypervisor, there would need to be a way to say that it gets a dedicated core plus the other 2 VPSs get a dedicated core. That leaves 3 pooled cores to serve the 6 VPSs that are allowed to overcommit. Is there a way to set up a pooled set of cores for a given list of VPSs? I think I may have to use separate physical machine for the VPSs with dedicated cores and the ones with overcommitted ones. Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html I think you can achieve that on some simple level DIY with taskset from util-linux(-ng). HTH, Z. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: Reserve CPU cores for specific guests?
I think you can achieve that on some simple level DIY with taskset from util-linux(-ng). That is a good utility to know. I did not know about that earlier. Thanks for the info. I am wondering one thing though: I will either need to call taskset when executing the process or run taskset on a PID after it starts up. Unless there is a way to tell KVM to call taskset when starting a guest, I think that is going to be hard to automate since the guests will get different PID each time they are started. Any suggestions? Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Reserve CPU cores for specific guests?
On Sun November 8 2009, Neil Aggarwal wrote: I think you can achieve that on some simple level DIY with taskset from util-linux(-ng). That is a good utility to know. I did not know about that earlier. Thanks for the info. I am wondering one thing though: I will either need to call taskset when executing the process or run taskset on a PID after it starts up. Unless there is a way to tell KVM to call taskset when starting a guest, I think that is going to be hard to automate since the guests will get different PID each time they are started. Any suggestions? None directly related, but libvirt's kvm support supports pinning a vm to a physical cpu. At least it has the option in virt-manager. Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- Thomas Fjellstrom tfjellst...@shaw.ca -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: Reserve CPU cores for specific guests?
None directly related, but libvirt's kvm support supports pinning a vm to a physical cpu. At least it has the option in virt-manager. That is exactly what I needed. My KVM host does not have a GUI so I have been using virsh. I did not notice that option before. Thank you, Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
