[CentOS-virt] What are KVM guest cores?

2010-11-18 Thread MargoAndTodd
Hi All, What are guest cores in KVM? Are they fake, like everything else in the guest? Just another process running on the host emulating a core? Or are the guest cores actually connected directly to the physical cores on my motherboard? Many thanks, -T

Re: [CentOS-virt] SPICE Benchmark

2010-11-18 Thread Pasi Kärkkäinen
On Wed, Nov 17, 2010 at 10:02:49PM -0500, Scott Dowdle wrote: Greetings, - Original Message - So as I understand it correctly, this whole SPICE thing is just something like VNC on steroids? Why can't we have this SPICE thing work on physical hosts as well? SPICE was

[CentOS-virt] [HOWTO] Running Xen 4.0 host (dom0) with Redhat Enterprise Linux 6 (RHEL6)

2010-11-18 Thread Pasi Kärkkäinen
Hello, If you're interested in running Xen 4.0 hypervisor/dom0 on RHEL6, take a look at here: http://wiki.xen.org/xenwiki/RHEL6Xen4Tutorial It explains steps needed to rebuild Xen 4.0.1 src.rpm from Fedora on RHEL6, and how to fetch dom0 capable 2.6.32.x kernel from upstream git repository. It

Re: [CentOS-virt] [HOWTO] Running Xen 4.0 host (dom0) with Redhat Enterprise Linux 6 (RHEL6)

2010-11-18 Thread Kenni Lund
2010/11/18 Pasi Kärkkäinen pa...@iki.fi: Hello, If you're interested in running Xen 4.0 hypervisor/dom0 on RHEL6, take a look at here: http://wiki.xen.org/xenwiki/RHEL6Xen4Tutorial It explains steps needed to rebuild Xen 4.0.1 src.rpm from Fedora on RHEL6, and how to fetch dom0 capable

[CentOS-virt] what scheduling algorithm does KVM use?

2010-11-18 Thread Nick
This may not be the best place to ask, but I was prompted by a question about guest cores on KVM. We currently use VMWare Server (v1.0) on CentOS5. It supports up to two virtual CPUs, but not very well, as I understand it. VMWare Server 2.0 might do better at supporting the same maximum of 2

Re: [CentOS-virt] what scheduling algorithm does KVM use?

2010-11-18 Thread Kenni Lund
2010/11/19 Nick oinksoc...@letterboxes.org: The problem with this is that it is obviously more of a constraint to have two physical CPUs available.  Therefore adding virtual CPUs to a co-scheduled VM can actually make performance worse if the physical CPUs are under any sort of contention.  

Re: [CentOS-virt] SPICE Benchmark

2010-11-18 Thread Scott Dowdle
Greetings, - Original Message - Google's NX implementation is called 'neatx': http://code.google.com/p/neatx/ Thanks. I was looking for that. NX the protocol is open already.. :) It is for all versions before 4.0. 4.0 will be completely closed. TYL, -- Scott Dowdle 704 Church

Re: [CentOS-virt] what scheduling algorithm does KVM use?

2010-11-18 Thread Nick
Thanks for the quick reply. On 18/11/10 23:45, Kenni Lund wrote: The good thing about KVM compared to other virtualization solutions, is that KVM doesn't try to reinvent the wheel. It leaves scheduling to the Linux kernel, so whatever your Linux system is setup to use, KVM will use that. You

Re: [CentOS-virt] What are KVM guest cores?

2010-11-18 Thread Kenni Lund
Do you have a rule of thumb as to how many core to assign to a guest?  For instance, with an Intel x5650 with 6 real and 12 hyperthreaded cores, how many cores would you assign to the guest? It fully depends on the load of your guests and how many guests you want/need to run on a single

Re: [CentOS-virt] what scheduling algorithm does KVM use?

2010-11-18 Thread Kenni Lund
2010/11/19 Nick oinksoc...@letterboxes.org: Thanks for the quick reply. On 18/11/10 23:45, Kenni Lund wrote: The good thing about KVM compared to other virtualization solutions, is that KVM doesn't try to reinvent the wheel. It leaves scheduling to the Linux kernel, so whatever your Linux