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Re: [Xen-users] annoying 2 - 3 second lag every few minutes in Windows XP VM on Debian 6 Squeeze

  • To: "Iordan Iordanov" <iordan@xxxxxxxxxxxxxxx>
  • From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
  • Date: Fri, 10 Jun 2011 19:22:36 +0100
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Fri, 10 Jun 2011 11:23:37 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acwnm2FykNlVWojYQEKR850rhc6TkQ==
  • Thread-topic: [Xen-users] annoying 2 - 3 second lag every few minutes in Windows XP VM on Debian 6 Squeeze


Have you tried a vm with the pv drivers installed?

What about Linux vms? 


On 10 Jun 2011, at 19:15, "Iordan Iordanov" <iordan@xxxxxxxxxxxxxxx> wrote:

> Hi,
> I don't know if this is a known issue, but I couldn't find any references to 
> it online, so I figured I'd start a topic here.
> I am running Debian 6 (Squeeze), and have the standard Debian 6 Xen kernel 
> and all the Xen support tools and packages that come from Squeeze. I've 
> created a Xen VM on the local disk:
> - dd if=/dev/zero of=somefile bs=1024k count=4000 to create the disk
> - Installed Windows XP sp3 from an ISO file (standard installation with no 
> extras).
> After booting into Windows, without any updates or anything running in 
> windows, I am observing a 2 - 3 second lag or freeze or whatever you want to 
> call it every few minutes. This happens no matter whether I am running a 
> "local console", or connecting via VNC to the virtual machine. During the 
> freeze, I've got ssh shells and lots of stuff open on the server, and 
> everything is running, so it's not the connection. Also, the machine is not 
> on a remote server, so it's not NFS or something like that.
> While running top, I observe that during the freeze, all of the Xen-related 
> processes drop off the list (i.e. do not take up any CPU-time). There are no 
> tell-tale dmesg messages. Here are some details of the system:
> Supermicro H8DGU-F motherboard, 2x Magny-cours CPU with 12 cores each, 64GB 
> of RAM. uname -a reports:
> Linux vsrv1 2.6.32-5-xen-amd64 #1 SMP Thu May 19 01:16:47 UTC 2011 x86_64 
> GNU/Linux
> The reason I am certain this is a Xen issue, is that running the exact same 
> VM image with qemu-kvm produces no such effect.
> Many thanks for any input and/or workarounds!
> Iordan Iordanov
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