Re: vCPU scalability for linux VMs

2010-05-06 Thread Alec Istomin
On Wednesday, May 5, 2010 at 01:53:55 -0400, Srivatsa Vaddagiri wrote: On Wed, May 05, 2010 at 12:31:11PM -0700, Alec Istomin wrote: On Wednesday, May 5, 2010 at 13:27:39 -0400, Srivatsa Vaddagiri wrote: My preliminary results show that single vCPU Linux VMs perform up to 10 times better

Re: vCPU scalability for linux VMs

2010-05-05 Thread Avi Kivity
On 05/05/2010 04:45 AM, Alec Istomin wrote: Gentlemen, Reaching out with a non-development question, sorry if it's not appropriate here. I'm looking for a way to improve Linux SMP VMs performance under KVM. My preliminary results show that single vCPU Linux VMs perform up to 10 times

Re: vCPU scalability for linux VMs

2010-05-05 Thread Alec Istomin
On Wednesday, May 5, 2010 at 04:43:32 -0400, Avi Kivity wrote: So you have a total of 32 vcpus on 8 cores? This is known to be problematic. You may see some improvement by enabling hyperthreading. exactly, 32 vCPUs on 8 core hardware that doesn't support hyperthreading (Clovertown E5335)

Re: vCPU scalability for linux VMs

2010-05-05 Thread Alec Istomin
On Wednesday, May 5, 2010 at 13:27:39 -0400, Srivatsa Vaddagiri wrote: My preliminary results show that single vCPU Linux VMs perform up to 10 times better than 4vCPU Linux VMs (consolidated performance of 8 VMs on 8 core pre-Nehalem server). I suspect that I'm missing something major and

Re: vCPU scalability for linux VMs

2010-05-05 Thread Srivatsa Vaddagiri
On Wed, May 05, 2010 at 12:31:11PM -0700, Alec Istomin wrote: On Wednesday, May 5, 2010 at 13:27:39 -0400, Srivatsa Vaddagiri wrote: My preliminary results show that single vCPU Linux VMs perform up to 10 times better than 4vCPU Linux VMs (consolidated performance of 8 VMs on 8 core

vCPU scalability for linux VMs

2010-05-04 Thread Alec Istomin
Gentlemen, Reaching out with a non-development question, sorry if it's not appropriate here. I'm looking for a way to improve Linux SMP VMs performance under KVM. My preliminary results show that single vCPU Linux VMs perform up to 10 times better than 4vCPU Linux VMs (consolidated