This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Re: HVM network performance

To: Andrew Theurer <habanero@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: HVM network performance
From: Andi Kleen <ak@xxxxxxx>
Date: Fri, 5 May 2006 21:33:13 +0200
Cc: Steve Dobbelstein <steved@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 05 May 2006 12:36:00 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <445B9FD0.6050800@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <OF58615EA2.425AD1BE-ON05257164.006F0267-05257164.0071C512@xxxxxxxxxx> <p73bquc6a83.fsf@xxxxxxxxxxxxx> <445B9FD0.6050800@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.9.1
On Friday 05 May 2006 20:56, Andrew Theurer wrote:
> Andi Kleen wrote:
> > Steve Dobbelstein <steved@xxxxxxxxxx> writes:
> >   
> >> I don't see any obvious problems in the Xenoprof output.  Anyone with
> >> experience with the inner workings of HVM domains care to comment on what
> >> might be causing the network performance to suffer so much?
> >>     
> >
> > You'll never get good throughput either from a NE2000 nor from a pcnet32
> > model.
> >   
> That was a suspicion of mine, but I wasn't sure.  I wonder if qemu-dm 
> could emulate another adapter (if so, which one would be best?) 

I looked some time ago at specs but all the promising adapters 
(widely used, good features, not too broken design) had very restrictive
license terms on their specifications (if they were available) 

They tended to only allow
using the specification to write drivers for the hardware.

> or do we  
> just punt and go for para-virt drivers.

That's the easy and probably fastest way short term, but long term 
it's a lot more work (you will need to write drivers for all the old and new 
guest OS
you want to run to get good performance) 

Also it's a logistical problem because you'll need to distribute and setup
all these drivers even if they are written.


Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>