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Re: [Xen-devel] Phoronix Xen vs KVM vs Virtualbox benchmark with Ubuntu 11.10

To: Alex Bligh <alex@xxxxxxxxxxx>, Pasi Kärkkäinen <pasik@xxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>

Date: Wed, 2 Nov 2011 10:30:37 -0700 (PDT)

Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, dokter@xxxxxxxxxxxxx, Alex Bligh <alex@xxxxxxxxxxx>

Delivery-date: Wed, 02 Nov 2011 10:31:42 -0700

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I didn't benchmarking too much but same Ubuntu Oneiric Instance ( on my box) may be loaded for virsh "Qemu" connection and may be loaded for "Xen 4.1.2" connection.
I see significant performance improvement for Oneiric PVHVM. It has performance pretty
close to KVM guests (virtio disks and NICs, Qemu-kvm 0.15.1). I suspect Phoronix
tested just HVM, regardless kernel rebuild in Ubuntu's style is very well documented.
It's a question of basic debian background nothing else.

Boris.

--- On Wed, 11/2/11, Alex Bligh <alex@xxxxxxxxxxx> wrote:

From: Alex Bligh <alex@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Phoronix Xen vs KVM vs Virtualbox benchmark with Ubuntu 11.10
To: "Alex Bligh" <alex@xxxxxxxxxxx>, "Boris Derzhavets" <bderzhavets@xxxxxxxxx>, "Pasi Kärkkäinen" <pasik@xxxxxx>, "Ian Campbell" <Ian.Campbell@xxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Alex Bligh" <alex@xxxxxxxxxxx>, dokter@xxxxxxxxxxxxx
Date: Wednesday, November 2, 2011, 1:07 PM

--On 2 November 2011 13:34:21 +0000 Alex Bligh <alex@xxxxxxxxxxx> wrote:

>> I was able to load Oneiric as PV on HVM at Xen 4.1.2 Oneiric Dom0
>> (3.1.0-030100-generic) after rebuilding the recent 3.1.0-3 Ubuntu's
>> kernel with
>> CONFIG_XEN_PLATFORM_PCI=y , uploading debian packages :-
>
> I very much doubt the reviewer did this. The -server variant (certainly
> on one of the Oneiric pre-releases) had CONFIG_XEN_PLATFORM_PCI=m so
> it should have been brought in by modprobe. I would guess -virtual
> is the same. The installer OTOH does /not/ have the module in the udeb
> which is an omission.

Actually, my mistake. -server does include CONFIG_XEN_PLATFORM_PCI
but
/lib/modules/3.0.0-12-server/kernel/drivers/xen/xen-platform-pci.ko
(at the very least) is not being built into the initrd for some
reason, even on the distributed version.

I somehow doubt the Phoronix guys built their own kernel. That
would imply they were using emulated disks.

-- Alex Bligh

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