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xen-users
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@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
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