Re: [CentOS-virt] performance differences between kvm/xen

2010-10-20 Thread Grant McWilliams
If I understand that paper correctly, HVM+VT-d outperforms PV by quite a lot (if you have VT-d support on your system). Thanks for that link. Just to make my criticism of the initial claim more clear: I don't claim that HVM can never be faster than PV but that you need to understand when

Re: [CentOS-virt] performance differences between kvm/xen

2010-10-20 Thread Dennis Jacobfeuerborn
On 10/20/2010 08:12 AM, Grant McWilliams wrote: If I understand that paper correctly, HVM+VT-d outperforms PV by quite a lot (if you have VT-d support on your system). Thanks for that link. Just to make my criticism of the initial claim more clear: I don't claim

Re: [CentOS-virt] performance differences between kvm/xen

2010-10-20 Thread Karanbir Singh
On 10/20/2010 12:35 PM, Dennis Jacobfeuerborn wrote: Being skeptical is the best approach in the absence of verifiable/falsifiable data. Today or tomorrow I'll get my hands on a new host system and although it is supposed to go into production immediately I will probably find some time to do

Re: [CentOS-virt] performance differences between kvm/xen

2010-10-20 Thread Tom Bishop
Ok so I'd like to help, since most folks have Intel Chipsets, I have a AMD 4p(16 core)/32gig memory opteron server that I'm running that we can get some numbers onbut it would be nice if we could run apples to apples...I have iozone loaded and can run that but would be nice to run using the

Re: [CentOS-virt] performance differences between kvm/xen

2010-10-20 Thread Grant McWilliams
On Wed, Oct 20, 2010 at 6:24 AM, Tom Bishop bisho...@gmail.com wrote: Ok so I'd like to help, since most folks have Intel Chipsets, I have a AMD 4p(16 core)/32gig memory opteron server that I'm running that we can get some numbers onbut it would be nice if we could run apples to apples...I