Jeroen Torrekens
2008-Jan-10 11:08 UTC
[Xen-users] Xen 3.0.3 Multiple VCPU performance issue
Dear List, We are running Xen 3.0.3 with a ubuntu dom0 (2.6.16 linux kernel). We have done some tests with a tool that calculate prime numbers. On a VM with one core, it takes 2.5 seconds to calculate a series of prime numbers. If I create a VM with 2 VCPUs it takes 9 seconds. The domU is also an Ubuntu Dapper. The physical hardware consists of 2x Xeon 5160 inside an Intel barebone (SR2500ALLX) with an LSI raid controller and 16GB of memory. VT is enabled in the bios. I know the tool only uses one thread, but it should take the same amount of time on both machines. The rest of the machine is identical (disk, memory, OS version, .). Someone has a hint on this where I can start my search on what is causing this behavior? If you need more info, I''ll be happy to give it to you. Thanks in advance! Jeroen _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Kotsovinos, Evangelos \(IT\)
2008-Jan-11 10:09 UTC
RE: [Xen-users] Xen 3.0.3 Multiple VCPU performance issue
We''ve also come across performance problems with multiple VCPUs on 3.0.3 - does anyone know if this has improved at all in 3.1? Cheers, Evangelos From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Jeroen Torrekens Sent: 10 January 2008 11:08 To: xen-users@lists.xensource.com Subject: [Xen-users] Xen 3.0.3 Multiple VCPU performance issue Dear List, We are running Xen 3.0.3 with a ubuntu dom0 (2.6.16 linux kernel). We have done some tests with a tool that calculate prime numbers. On a VM with one core, it takes 2.5 seconds to calculate a series of prime numbers. If I create a VM with 2 VCPUs it takes 9 seconds. The domU is also an Ubuntu Dapper. The physical hardware consists of 2x Xeon 5160 inside an Intel barebone (SR2500ALLX) with an LSI raid controller and 16GB of memory. VT is enabled in the bios. I know the tool only uses one thread, but it should take the same amount of time on both machines. The rest of the machine is identical (disk, memory, OS version, ...). Someone has a hint on this where I can start my search on what is causing this behavior? If you need more info, I''ll be happy to give it to you. Thanks in advance! Jeroen -------------------------------------------------------- NOTICE: If received in error, please destroy and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users