Unresponsive Solaris 10 Guest on Oracle VM

Hi there
I've got an Oracle VM 2.2.1 installation on an X4150 which has a few guests: RHEL5.6, Windows and Solaris 10.
Both RHEL and Windows are performing really smoothly and as expected, however the Solaris guest starts fast but becomes unresponsive within a few minutes of booting.
Unresponsive in that although there are no userland processes running, the guest becomes really claggy.
For example, running top freezes every few seconds for a few seconds, and the same with ssh connections into the server. Basically, every so many words that you type, a pause will be introduced, rendering the whole VM unresponsive.
When running top, this unusual behaviour shows itself in occasional bursts in kernel activity. Although the load average and CPU utilisation is low, the kernel activity will spike to 100% every few seconds. I can't find any messages in the /var/adm/messages file that could explain this other than some weird messages at boot about the system date:
May 30 15:51:19 infra1 ntpdate[247]: [ID 774510 daemon.notice] step time server 10.2.0.30 offset 35788.403198 sec
May 30 15:51:19 infra1 xntpd[256]: [ID 702911 daemon.notice] xntpd 3-5.93e+sun 03/08/29 16:23:05 (1.4)
May 30 15:51:19 infra1 xntpd[256]: [ID 301315 daemon.notice] tickadj = 5, tick = 10000, tvu_maxslew = 495, est. hz = 100
May 30 15:51:19 infra1 xntpd[256]: [ID 266339 daemon.notice] using kernel phase-lock loop 0041, drift correction 0.00000
May 30 15:51:19 infra1 last message repeated 1 time
May 30 15:51:20 infra1 genunix: [ID 982299 kern.warning] WARNING: Time of Day clock error: reason [Stalled]. -- Stopped tracking Time Of Day clock.
May 30 15:51:44 infra1 genunix: [ID 773945 kern.info] UltraDMA mode 5 selected
May 30 15:51:44 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:44 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:44 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:44 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:44 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:44 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:44 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:44 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:48 infra1 genunix: [ID 408114 kern.info] /pseudo/zconsnex@1/zcons@0 (zcons0) online
May 30 15:51:49 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:49 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:49 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:49 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:49 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:49 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:49 infra1 genunix: [ID 773945 kern.info] UltraDMA mode 5 selected
May 30 15:51:49 infra1 genunix: [ID 935449 kern.info] ATA DMA off: disabled. Control with "atapi-cd-dma-enabled" property
May 30 15:51:49 infra1 genunix: [ID 882269 kern.info] PIO mode 4 selected
May 30 15:51:59 infra1 rootnex: [ID 349649 kern.info] xsvc0 at root
May 30 15:51:59 infra1 genunix: [ID 936769 kern.info] xsvc0 is /xsvc
May 30 15:59:34 infra1 pcplusmp: [ID 272826 kern.info] pcplusmp: asy (asy) instance 0 irq 0x4 vector 0xb0 ioapic 0x1 intin 0x4 is bound to cpu 1
Other unusual symptoms include the top utility not loading for seconds or minutes (it fluctuates) when you initially try and run it.
What's more strange is the fact that the system starts-out as being fast and responsive for the first few minutes after boot, but quickly slows down like this.
I don't think there are any network issues, as other VMs on the same Oracle VM server run well, and even pings to the Solaris guest appear fine. Its literally like the system itself is being paused when these random delays occur. The routing on the system also appears to be normal.
Solaris release installed is Solaris 09/10 and I've just installed the May 2011 Recommended Patch Cluster on it, to bring the kernel to 144489-12.
Any suggestions would be most appreciated.

The solution turned-out to be a known bug with OVM and Solaris 10 guests. We had to pin down the VCPUs to physical CPUs to workaround this.

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sree
"jian zhang" <[email protected]> wrote in message
news:[email protected]...
Sree,
"Sree Bodapati" <[email protected]> wrote:
Hi jian
Will it be possible for you to post your test code here?I attached the source code to this email.
>
Also make sure the client libraries / oracle client installation on your
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Jian
>
sree
"jian zhang" <[email protected]> wrote in message
news:[email protected]...
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