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Re: [Xen-users] Xen and KVM.

To: "Johannes Schlatow" <johannes.schlatow@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen and KVM.
From: "Emre Erenoglu" <erenoglu@xxxxxxxxx>
Date: Tue, 18 Nov 2008 21:04:07 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, Mauro <mrsanna1@xxxxxxxxx>
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Hi again,

On Tue, Nov 18, 2008 at 8:53 PM, Johannes Schlatow <johannes.schlatow@xxxxxxxxxxxxxx> wrote:
- afaik no PCI passthrough
- still in development and not as stable as Xen

Well I don't see stability problem on my test systems. For PCI passthough, check out this announcement, it's coming:

My Win2000 Server is far more faster on Xen, maybe this was an issue
with the standard interfaces between dom0 and guest. If you can use
virtio devices (I think the frontend drivers are included since kernel
version 2.6.23 or 2.6.25) there will be no bottle neck anymore.

I find KVM faster. Especially on linux-on-linux virtualizations, KVM with virtio is very fast. Near native in fact.

For Windows guest installations, the virtio network driver is also very fast (above gigabit speeds on a Core2Duo). The emulated disk benchmarks (simple benchmarks) were about 60 meg/sec on a raid0 array of two sata disks.  I guess it will also be very fast if it can be run over a AoE or iScsi host.
With some kernel hacks I newly got Xen running on my hardware (nvidia
630a chipset). So this will be my personal solution for some month.

very difficult, time consuming, hair trimming. I gave up personally after Ubuntu Hardy (2.6.22 dom0 kernel) and switched to KVM on desktop.

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