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[Xen-users] dom0 hangs in xen 4.0.1-rc3-pre
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-users] dom0 hangs in xen 4.0.1-rc3-pre |
| From: | Jia Rao <rickenrao@xxxxxxxxx> |
| Date: | Fri, 24 Sep 2010 00:22:21 -0400 |
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| Delivery-date: | Thu, 23 Sep 2010 21:23:41 -0700 |
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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 !
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