On Thu, Jun 09, 2016 at 12:35:06PM -0600, Chris Friesen wrote: > On 06/09/2016 05:15 AM, Paul Michali wrote: > > 1) On the host, I was seeing 32768 huge pages, of 2MB size. > > Please check the number of huge pages _per host numa node_. > > > 2) I changed mem_page_size from 1024 to 2048 in the flavor, and then when > > VMs > > were created, they were being evenly assigned to the two NUMA nodes. Each > > using > > 1024 huge pages. At this point I could create more than half, but when there > > were 1945 pages left, it failed to create a VM. Did it fail because the > > mem_page_size was 2048 and the available pages were 1945, even though we > > were > > only requesting 1024 pages? > > I do not think that "1024" is a valid page size (at least for x86).
Correct, 4k, 2M and 1GB are valid page sizes. > Valid mem_page_size values are determined by the host CPU. You do not need > a larger page size for flavors with larger memory sizes. Though note that page sizes should be a multiple of favour mem size unless you want to waste memory. eg if you have a flavour with 750MB RAM, then you probably don't want to use 1GB pages as it waste 250MB Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
