I haven't ever really used cgroups. I always figured a fair host scheduler is good enough to handle spreading load. So I don't know if it will fit exactly what you need. I don't think so. I also don't know of any other options. I will say, If I gave 4 VMs a single cpu each on a 4 core host, I would expect the host to be fully loaded. I wouldn't see any reason for the host not to be fully loaded. That is after all one of the key points of virtualization. Better utilization of hardware. On Thursday 02 April 2009 17:33:07 Francisco Mazzeo wrote: > Hello Brian, > > Thanks for the reply. is there a wiki about cgroupds and how to set them > up? > > Also, I tried just for kicks to see what would happen if I create 4 > Virtual Windows machines, run prime95 (a tool that does iterations > like superpi to stress test memory/cpu) on all of them and just assign > them only ONE core to them. > > The server node did not crash and you are right, however I was hoping > for the server load to stay below 50% as I only gave it one single > core to each KVM VE. Instead it seems like KVM let each VE get one > slice of each of the 4 cores of my CPU, which did not accomplish what > I wanted. > > Is cgroupds the only choice available? > > -- Francisco > > On Thu, Apr 2, 2009 at 3:29 PM, Brian Jackson <iggy@xxxxxxxxxxx> wrote: > > There's CPU cgroups. It doesn't have exactly the ability you are after, > > but it is able to limit process(es) CPU usage. Maxing out CPU usage won't > > crash your server. The kernel will arbitrate sharing the CPU evenly among > > processes/VMs. > > > > --Brian Jackson > > > > On Thursday 02 April 2009 16:41:10 Francisco Mazzeo wrote: > >> Hello, > >> > >> I am a new user to KVM and was wondering if there was any way to > >> limit a VE from using up all the resources of the processor. > >> > >> > >> Right now I have a Quad core 2.5Ghz, I have a KVM VE (running windows > >> server 2003) and assigned 4 CPUs to it. If I max out the load for that > >> VE, the entire host node load will be 100% which may crash it if I > >> hosted more than 1 single VE. > >> > >> OpenVZ has cpulimit command, does KVM have something similar or any > >> way that I can implement a limit on a single VE? Say I want to only > >> give a max of 500Mhz per core, to total 2Ghz to the VE. > >> > >> Thanks > >> Francisco > >> www.navigatoris.net / www.serversoutlet.com > >> -- > >> To unsubscribe from this list: send the line "unsubscribe kvm" in > >> the body of a message to majordomo@xxxxxxxxxxxxxxx > >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
