dom0 hangs in xen 4.0.1-rc3-pre

[Jia Rao <rickenrao@gmail.com>]

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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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