Medlyn, Dayne (VSL - Ft Collins) wrote:
All,
I am trying to understand the use of NumberOfBlocks and ConsumableBlocks in the Xen_Memory class, specifically for the Xen host. What I have noticed is that between libvirt-cim-0.4.1 and libvirt-cim-0.5.2 the values for NumberOfBlock is now different than ConsumableBlocks and much larger than the physical memory installed on the system. Is it the case that NumberOfBlocks represents the maximum possible blocks for the hardware, or some such number ConsumableBlocks is the memory that is actually installed in the system? On my system, however, NumberOfBlocks reports 16TB where /proc/meminfo reports 32Tb for VmallocTotal. In short, should I be using ConsumableBlocks to determine the total physical memory on the system?
Hi Dayne, It looks like there is a bug here. Currently, the providers use the following representation: NumberOfBlocks: max amount of memory that can be allocated to a guest ConsumableBlocks: current memory allocated to the guest However, these values should be reversed based on the attribute definitions. Here's an example using one of the guests on my system: # virsh dominfo rstest_domainId: - Name: rstest_domain UUID: 746de06d-cb45-4efd-bc18-bf91d10bec84 State: shut off CPU(s): 1 Max memory: 131072 kB Used memory: 130048 kB Autostart: disable We take the max and used memory values libvirt reports and then convert them based on the block size. # wbemcli gi 'http://localhost:5988/root/virt:Xen_Memory.CreationClassName="Xen_Memory",DeviceID="rstest_domain/mem",SystemCreationClassName="Xen_ComputerSystem",SystemName="rstest_domain"' -nl localhost:5988/root/virt:Xen_Memory.CreationClassName="Xen_Memory",DeviceID="rstest_domain/mem",SystemCreationClassName="Xen_ComputerSystem",SystemName="rstest_domain" <snip> -TransitioningToState=12 -SystemCreationClassName="Xen_ComputerSystem" -SystemName="rstest_domain" -CreationClassName="Xen_Memory" -DeviceID="rstest_domain/mem" <snip> -BlockSize=4096 -NumberOfBlocks=32768 -ConsumableBlocks=32512 <snip> -- Kaitlin Rupert IBM Linux Technology Center kaitlin@linux.vnet.ibm.com