RE: [Xen-users] Xen 3.0.3 Multiple VCPU performance issue

["Kotsovinos, Evangelos \(IT\)" <Evangelos.Kotsovinos@xxxxxxxxxxxxxxxxx>]

 

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@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jeroen Torrekens
Sent: 10 January 2008 11:08
To: xen-users@xxxxxxxxxxxxxxxxxxx
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@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users