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Re: [Qemu-devel] [PATCH 00/10] xen: pv domain support.

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 00/10] xen: pv domain support.
Date: Sun, 05 Apr 2009 15:33:43 +0300
User-agent: Thunderbird (X11/20090320)

Alexander Graf wrote:

1) Migration path. If you could already use KVM on a Xen host, you could have Xen PV guests and KVM guests in parallel, easing migration to KVM for customers.

I like this, of course, but we have a path through Xenner. Maybe this (kvm-on-xen) path will be easier to take.

Oh, I thought Xenner was semi on hold? Is it still actively developed? I thought Gerd's main goal for now was to get qemu-dm into upstream qemu for now.

I understood that Xenner is the next thing on the list.

With npt/ept pv performance might be higher running under kvm+xenner than with software-only Xen by letting the guest kernel access pagetables directly. Though Gerd had some issues with 64-bit guests IIRC, which is a pity since it's there that the pv performance hit is greatest.

Well that might be true, but I'm not fully convinced yet :-). Either way with "current" hardware (pre-Nehalem, pre-Barcelona) PV is still faster.

Right, but every day this is becoming less important.

Also, FWIW IO performance on PV Xen is still way superior to KVM. Please correct me if I stand wrong there.

We still have some work some work to do on virtio, but bandwidth should be comparable. And it has nothing to do with pv-vs-fv.

error compiling committee.c: too many arguments to function

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