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[Xen-users] System Freezes

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Subject: [Xen-users] System Freezes
From: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
Date: Wed, 16 Jun 2010 09:29:27 +0100
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Thread-topic: System Freezes
Hi Everyone,
I wish to gather whether the following issue is a disk or CPU issue.
U have a Xen host, running Ubuntu 10.04 64 bit Dom0. It has a single hard drive.
FOr testing purposes, I ran 2 DomUs. Both running Ubuntu 10.04 64bit PV. From a remote machine, I ssh'ed into the 2 VMs.
On one session I ran a script that would constantly download a file from the net. Delete it, then repeat.
On the other session, I ran a script which ran dd to create a 1G file, delete it, and repeat.
On my remote machine, I also ran another 2 terminals to ping each DomU.
Everything seemed ok, until I decided to move a window on the Dom0's screen (Via VGA port and USB keyboard and mouse). The system just became unresponsive for a couple of minutes. Pings stoped working, ssh sessions woudn't refresh..
Now, I also had an HVM pfsense machine running, which has a real NIC passed through to it. I can't be 100% sure, however I think that its web GUI was still responsive when accessing it via the real NIC's IP. This leads me to think that the only machine that freezes is the Dom0, which includes the bridge that the DomUs are connected to.
Does the above sound like a disk issue or CPU? What can I do to help things? Maybe I should run a Dom0 without a windows manager?
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