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
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