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* dom0 hangs in xen 4.0.1-rc3-pre
@ 2010-09-24  4:22 Jia Rao
  2010-09-24 10:27 ` [Xen-devel] " Pasi Kärkkäinen
                   ` (2 more replies)
  0 siblings, 3 replies; 16+ messages in thread
From: Jia Rao @ 2010-09-24  4:22 UTC (permalink / raw)
  To: xen-devel, xen-users


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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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^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2010-09-29 18:01 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-09-24  4:22 dom0 hangs in xen 4.0.1-rc3-pre Jia Rao
2010-09-24 10:27 ` [Xen-devel] " Pasi Kärkkäinen
2010-09-24 19:08 ` Jeremy Fitzhardinge
2010-09-24 20:48   ` Jia Rao
2010-09-24 21:01     ` Jia Rao
2010-09-25 12:12 ` Andreas Kinzler
2010-09-26  1:12   ` [Xen-users] " Jia Rao
2010-09-27 14:06   ` Bruce Edge
2010-09-27 14:22     ` [Xen-users] " Andreas Kinzler
2010-09-27 14:32       ` Bruce Edge
2010-09-27 14:50         ` Andreas Kinzler
2010-09-28  1:57           ` [Xen-devel] " Jiang, Yunhong
2010-09-28  8:25             ` Andreas Kinzler
2010-09-28 16:04           ` Bruce Edge
2010-09-29 17:46             ` Andreas Kinzler
2010-09-29 18:01               ` Re: [Xen-users] " Bruce Edge

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