On 06/21/2012 07:51 PM, Eduardo Habkost wrote:
Hi,
I just noticed libvirt tries to use the -numa option in a way that qemu never understood: if a node is configured to have a non-contiguous set of CPUs, it tries to generate a command-line option that looks like:
"-numa node,nodeid=...,cpus=0,2,4,mem=..." ^^^^^
But this format was never supported by qemu. This format is even a bit weird, as "," is an option separator, and it is being used as a separator _inside_ an option.
Exactly this was the reason back then to not support non-contiguous set of CPUs. Inside qemu there is no reason why this shouldn't work, it was just hard to write on the command line. So after a short discussion we decided to drop this for the time being. If you have a great idea how to specify this (I think a comma will not work, because it will be catched earlier), I am all ears. Regards, Andre.
My question is: should we support this option format in qemu, or should we change libvirt to use another format (that has yet to be implemented, because currently there's no way to specify a non-contiguous set of CPUs for a NUMA node).
Any suggestions?
-- Andre Przywara AMD-Operating System Research Center (OSRC), Dresden, Germany