linux-kernel - Re: [PATCHv2 0/2] vhost: a kernel-level virtio server

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Message-ID: <20090812130433.GB29200@redhat.com>
Date:	Wed, 12 Aug 2009 16:04:34 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-mm@...ck.org,
	"akpm@...ux-foundation.org >> Andrew Morton" 
	<akpm@...ux-foundation.org>, hpa@...or.com,
	Patrick Mullaney <pmullaney@...ell.com>
Subject: Re: [PATCHv2 0/2] vhost: a kernel-level virtio server

On Wed, Aug 12, 2009 at 08:41:31AM -0400, Gregory Haskins wrote:
> Michael S. Tsirkin wrote:
> > On Wed, Aug 12, 2009 at 07:56:05AM -0400, Gregory Haskins wrote:
> >> Michael S. Tsirkin wrote:
> 
> <snip>
> 
> >>>
> >>> 1. use a dedicated network interface with SRIOV, program mac to match
> >>>    that of guest (for testing, you can set promisc mode, but that is
> >>>    bad for performance)
> >>
> >> Are you saying SRIOV is a requirement, and I can either program the
> >> SRIOV adapter with a mac or use promis?  Or are you saying I can use
> >> SRIOV+programmed mac OR a regular nic + promisc (with a perf penalty).
> > 
> > SRIOV is not a requirement. And you can also use a dedicated
> > nic+programmed mac if you are so inclined.
> 
> Makes sense.  Got it.
> 
> I was going to add guest-to-guest to the test matrix, but I assume that
> is not supported with vhost unless you have something like a VEPA
> enabled bridge?
> 
> <snip>

Presumably you mean on the same host?  There were also some patches to
enable local guest to guest for macvlan, that would be a nice
software-only solution.  For back to back, I just tried over veth, seems
to work fine.

> >>> 3. add vhost=ethX
> >> You mean via "ip link" I assume?
> > 
> > No, that's a new flag for virtio in qemu:
> > 
> > -net nic,model=virtio,vhost=veth0
> 
> Ah, ok.  Even better.
> 
> Thanks!
> -Greg
> 


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