WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

[Xen-users] Re: [Xen-devel] dom0 hangs in xen 4.0.1-rc3-pre

To: Jia Rao <rickenrao@xxxxxxxxx>
Subject: [Xen-users] Re: [Xen-devel] dom0 hangs in xen 4.0.1-rc3-pre
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Fri, 24 Sep 2010 13:27:29 +0300
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 24 Sep 2010 03:28:36 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <AANLkTimPVj-AXyR8DuQRxuAwcFwHm0sVkgiXvkA1+f7-@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <AANLkTimPVj-AXyR8DuQRxuAwcFwHm0sVkgiXvkA1+f7-@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.18 (2008-05-17)
On Fri, Sep 24, 2010 at 12:22:21AM -0400, Jia Rao wrote:
>    Hi all,
>    I saw reproducible hangs in dom0 when the system is under heavy load.
>    Testbed settings:
>    four dom0s share a nfs server for domU images. a total number of 24 domUs
>    (6 domUs on each dom0). When the system under heavy load, busy processing
>    e-commerce requests, one or two of the dom0s hanged. no input can be
>    accepted and reboot is necessary.
>    Anyone had the same experience? The causes I can come up are following:
>    1. nfs is not configured properly. But before I upgraded to xen 4, xen 3
>    worked pretty well.
>    2. the domU's are using tap2 disk. Any similar problem in testing tap2?
>    3. Or the problem is from the new pvops kernel ? All the domU are cpu
>    intensive and not generating a lot of IOs.
>    Unfortunately, dom0's dmesg and xm log recorded nothing about the hangs.
>    FYI:
>    Xen: 4.0.1-rc3-pre
>    dom0: centos 2.6.32.1 pvops 8G, 8 cores
>    domU: 2.6.18.8 PV kernel 1G, 4 VCPU
>    NFS server: 8G, 8 cores, 4-disk RAID 5 nfs version 3 over TCP, rw size 4K
>    Interconnect: Gigabyte Ethernet.
>    Thanks a lot !

Well first of all test with Xen 4.0.1 final, does that help? If not, try
Xen 4.0.2-rc1-pre, which has some additional IRQ related fixes.

-- Pasi


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