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Re: [Xen-users] [Xen-devel] Cannot Start Linux Paravirtualized (PV) Guests with Xen 4.2-unstable
On 30/03/2012 05:09, Sergey Zhukov wrote:
3) When I was installing Ubuntu 12.04 Beta 1 Precise Pangolin amd64 as a HVM domU in either Xen 4.1.3-rc1-pre or Xen 4.2-unstable, it hanged at COPYING FILES during installation. Hence I have to abort the HVM domU installation. Disk I/O performance is very poor. 4) Disk I/O performance is very poor with Debian 6.0 Squeeze PV domU in Xen 4.2-unstable and with Fedora 16 x86-64 PV domU in Xen 4.1.3-rc1-pre. The mouse cursor movement in both Fedora 16 and Debian 6.0 Squeeze PV domU is very sluggish and unresponsive. It also takes a long time to format filesystems and install packages in PV domU during OS installation. What causes the performance penalty in disk I/O? 5) Disk I/O performance is also very poor with Ubuntu 12.04 Beta 1 HVM domU installation. Formatting filesystems and copying files during installation take a long time. Mouse cursor movement is also very unresponsive.I installed Ubuntu 12.04 beta server (AMD 64) and xen hypervisor from ubuntu xen packages (v4.1). Then I installed Ubuntu 10.04 server as PV DomU and Ubuntu 10.04 desktop as HVM DomU. I could not enable IO virtualization, because iommu=1 and iommu=verbose parameters seem to be not working.
Dear Sergey Zhukou, Thank you very much for your reply.I did not have to specify IOMMU=1 and IOMMU=verbose in my multiboot xen.gz command line in GRUB2. IOMMU is enabled by default in Xen 4.2-unstable.
sudo xl dmesg | grep 'I/O Virtualisation' (XEN) I/O Virtualisation Enabled
When I run tests for my specific software I found, that in Ubuntu 10.04 HVM DomU there are too many interrupts when dealing with network. Processor took about 50%si. I did not test disk IO, but think the picture should be the same.
When I am installing Ubuntu 12.04 Beta 1 HVM domU, the network connection gets disconnected and re-connected many times. Did your installation hanged at copying files while installing Ubuntu 10.04 HVM domU?
But I found solution, which works perfect for me. I installed Ubuntu 12.04 desktop beta (i386) as PVHVM DomU. It installed without hangs and it works very fast with network and disk.
I do not know what is PVHVM, I only know PV domU and HVM domU separately.
Only one thing looks ugly: I can't change maximal resolution of the desktop more than 1024x768 (despite of settings stdvga=1 and videoram=16) Also, I would like to know, how to enable verbose logs for iommu, because xm dmesg does not show me any information about VT-d. I have the line (XEN) Command line: placeholder iommu=verbose in the dmesg logs, but still not got verbose logs...
I do not know how to enable verbose logs for IOMMU. Have you tried "sudo xl dmesg | grep VT-d"?
-- Yours sincerely, Mr. Teo En Ming (Zhang Enming) Singapore _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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