VM outperforming host

2013-12-29 Thread John Paul Walters
HI, I’ve been benchmarking of several GPU-enabled applications on both physical hardware and within KVM. To my surprise, I’ve found a small subset of benchmarks that are able to outperform the host system by as much as 15% in some cases, and I’m hoping that someone may be able to offer some in

Re: KVM cpu limitations

2011-08-09 Thread John Paul Walters
On Aug 9, 2011, at 5:13 AM, Avi Kivity wrote: > On 08/08/2011 10:18 PM, John Paul Walters wrote: >> On Jul 21, 2011, at 2:10 AM, Avi Kivity wrote: >> >> > On 07/21/2011 02:20 AM, John Paul Walters wrote: >> >> Hi, >> >> >> >> We h

Re: KVM cpu limitations

2011-08-08 Thread John Paul Walters
On Jul 21, 2011, at 2:10 AM, Avi Kivity wrote: > On 07/21/2011 02:20 AM, John Paul Walters wrote: >> Hi, >> >> We have a 256 core SGI Ultraviolet machine running RHEL 6.1 with qemu-kvm >> 0.13, and we'd like to be able to start large guest VMs of up to 256 cores

KVM cpu limitations

2011-07-20 Thread John Paul Walters
Hi, We have a 256 core SGI Ultraviolet machine running RHEL 6.1 with qemu-kvm 0.13, and we'd like to be able to start large guest VMs of up to 256 cores. I see that x86 guests are currently limited to 64 VCPUs. Is there any reason for this hard limitation? It appears that we can't get around