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[Xen-users] PVonHVM, Networking and xentop

  • To: xen-users@xxxxxxxxxxxxx
  • From: David Sutton <pere@xxxxxxxxxxxx>
  • Date: Thu, 25 Oct 2012 12:39:50 -0500 (CDT)
  • Delivery-date: Thu, 25 Oct 2012 17:41:37 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: DZbn0w5jCu9751lVk0fbVuPZ4bHztg==
  • Thread-topic: PVonHVM, Networking and xentop


  I have a domU running Ubuntu 12.04.1 LTS 64bit using PVonHVM which is working 
well but I noticed a quirk and just wanted to check it wasn't just my 
misunderstanding. On my dom0 (Arch Linux, 64bit, AMD Phenom 2 X4 965 CPU, Xen 
4.2.0 from my own PKGBUILD) I run "xl top" and xentop loads and shows all the 
currently running domains; only none of the domains have anything showing for 
network statistics (0's for NETS, NETTX and NETRX). I see Disk statistics for 
the two domU's; one is running Windows 7 and only shows that the VBD is 
allocated (1 VBDS, 0's for stats, but running the windows PVHVM drivers 
conflicted with the graphics drivers so wasn't expecting stats). The other domU 
is the Ubuntu one and it shows both the VBD and stats for it.

  I've been reviewing the configuration, in case I had mis-specified something, 
however it looks okay:

# Virtual Disk/Net
vif = [ 'mac=00:16:3E:3A:53:21,bridge=extbr0,vifname=websrv' ]

  I also checked the messages on the domU as well:

$ ( ethtool -i eth0 | grep driver && dmesg | grep -i "netfront" && dmesg | grep 
-i "virtual ethernet" )
driver: vif
[    0.000000] Netfront and the Xen platform PCI driver have been compiled for 
this kernel: unplug emulated NICs.
[    0.718539] Initialising Xen virtual ethernet driver.

  So, should there be disk statistics showing up under xentop? I happened to 
notice as I was troubleshooting another issue ( xl create was returning errors 
about networking but it was actually because I had set a bad keymap in the 
config; it booted ok once  I had fixed the keymap line )



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