[CentOS-virt] Windows Xen VM's have high guest CPU usage and poor performance
Pasi Kärkkäinen
pasik at iki.fiThu Jan 21 21:28:43 UTC 2010
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On Thu, Jan 21, 2010 at 11:37:02AM -0500, Ryan Pugatch wrote: > Eric Searcy wrote: > >> The install worked beautifully except that my VM now has an ip assigned > >> of 192.168.122.186 which I'm guessing is in relation to virbr0 which is > >> 192.168.122.1 on the host (and subsequently has no internet > >> connectivity). Is it possible for me to pass through to my network like > >> before so my VM can have an ip on my local network? > > > > Unless you specify a bridge in the xen conf file, it uses the first one > > it finds alphabetically, I believe. Do you use virbr0 for anything > > else? As an easy way of making sure xenbr0 is used, I removed the file > > /etc/libvirt/qemu/networks/autostart/default.xml which was auto-starting > > this DHCP (and NATted?) bridge, and I only was using direct access. But > > you can also make it explicit on the interface line, one of my HVM VMs > > has the following: > > > > vif = [ 'mac=00:16:3e:0a:4c:d2, bridge=xenbr0' ] > > > > Eric > > > That worked.. thanks Eric. However, even with the GPLPV drivers, I am > seeing a lot of CPU usage when I do anything on the Windows VM. It > isn't just the guest that is reporting CPU usage, though. When I watch > xm top, the CPU usage jumps on that VM. Not really sure what else can > be done to improve performance. > Check these tips: http://wiki.xensource.com/xenwiki/XenBestPractices And also this: http://wiki.xensource.com/xenwiki/XenCommonProblems -- Pasi
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