Re: [Xen-devel] Network freezing for paravirt linux, 3.0.3

To:	Andres Lagar Cavilla <andreslc@xxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Network freezing for paravirt linux, 3.0.3
From:	Keir Fraser <keir@xxxxxxxxxxxxx>
Date:	Tue, 28 Nov 2006 15:25:29 +0000
Delivery-date:	Tue, 28 Nov 2006 07:25:32 -0800
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<456C50DB.4090809@xxxxxxxxxxxxxx>
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>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	AccTAW+BrgPi1H70EduUoQAX8io7RQ==
Thread-topic:	[Xen-devel] Network freezing for paravirt linux, 3.0.3
User-agent:	Microsoft-Entourage/11.2.5.060620

On 28/11/06 15:08, "Andres Lagar Cavilla" <andreslc@xxxxxxxxxxxxxx> wrote:

> It thus looks like the culprit is netfront, or possibly a
> netback/netfront interaction (Q: is netback employed in the qemu-dm
> emulation path, or packets are simply relayed from the tap to vifX.Y?).
> I would love to provide more information, but I'm unsure where to get it.

What version of netback are you running? The one from the 3.0.3 release is
known to have a bug which would cause high-bandwidth transfers to stall.

The offending function is netback.c:tx_add_credit(). You should be able to
take the version from xen-unstable and copy it into whatever version of
netback.c you are using.

 -- Keir

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

xen-users

Re: [Xen-devel] Network freezing for paravirt linux, 3.0.3