From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jia Rao Subject: dom0 hangs in xen 4.0.1-rc3-pre Date: Fri, 24 Sep 2010 00:22:21 -0400 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0830405526==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-users-bounces@lists.xensource.com Errors-To: xen-users-bounces@lists.xensource.com To: xen-devel@lists.xensource.com, xen-users@lists.xensource.com List-Id: xen-devel@lists.xenproject.org --===============0830405526== Content-Type: multipart/alternative; boundary=001636d34c2998ca7e0490f9b904 --001636d34c2998ca7e0490f9b904 Content-Type: text/plain; charset=ISO-8859-1 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 ! --001636d34c2998ca7e0490f9b904 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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.=A0

Anyone had the same experience? The causes I can come u= p 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 te= sting tap2?

3. Or the problem is from the new pvop= s kernel ? All the domU are cpu intensive and not generating a lot of IOs.<= /div>

Unfortunately, dom0's dmesg and xm log recorded not= hing 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: G= igabyte=A0Ethernet.

Thanks a lot !
--001636d34c2998ca7e0490f9b904-- --===============0830405526== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users --===============0830405526==--