Red Hat Bugzilla – Bug 475856
VM performance numbers should be relative to the guest, not the host
Last modified: 2011-07-12 09:58:47 EDT
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:18.104.22.168) Gecko/2008111318 Ubuntu/8.10 (intrepid) Firefox/3.0.4
Imagine a host with 4 CPUs and 4 GB of RAM. Imagine a guest with one CPU and 512 MB of RAM. If it maxes out its resources, it'll show as using 25% CPU and 12.5% of RAM. This is relative to the host, but that's not really meaningful when you're looking at the guest. Instead, those numbers should be relative to the guest, so it'd be 100% and 100%. As a special case, when the startup and maximum RAM are the same, it should just show the amount (512 MB) because a constant 100% isn't really useful.
The numbers on the main virt-manager screen (as opposed to on the detail of a specific host) are harder to define. I can make a case for both sets of numbers. I would argue that both should be available (in separate columns), but the relative-to-guest columns should be hidden by default.
The memory issues are gone in recent virt-manager, since we don't really show a graph for it anymore (since historically we haven't had _actual_ memory usage statistics from inside the guest, so it wasn't all that useful to show a graph here).
The CPU issue is tracked in other bugs, so closing as a dup
*** This bug has been marked as a duplicate of bug 629754 ***