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] HVM dropped packets

To: Nathan Stratton <nathan@xxxxxxxxxxxx>, Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] HVM dropped packets
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 08:53:45 +0100
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Wed, 26 Aug 2009 00:54:18 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <alpine.LFD.2.00.0908260242540.29767@xxxxxxxxxxxxxxxxx>
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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcomITLkX1qCLpAVRli/WzzU2ukwEQAASNLB
Thread-topic: [Xen-devel] HVM dropped packets
User-agent: Microsoft-Entourage/
On 26/08/2009 08:45, "Nathan Stratton" <nathan@xxxxxxxxxxxx> wrote:

>> I bet the drops are caused by the low performance of Qemu nic _emulation_.
> Does one emulate better then the rest?

e1000 is probably faster than the rest due to a more efficient hardware
interface better suited to emulation. You may still get receiver overruns
though (which I think was the source of the drops you were seeing?). That's
simply the host receiving packets faster than they can get stuffed through
the emulated interface.

 -- Keir

Xen-devel mailing list

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