On Thu, Oct 12, 2017 at 09:31:54PM +0200, Wim Ten Have wrote: > From: Wim ten Have <wim.ten.have@xxxxxxxxxx> > > Add support for describing NUMA distances in a domain's <numa> <cell> > XML description. > > Below is an example of a 4 node setup: > > <cpu> > <numa> > <cell id='0' cpus='0-3' memory='2097152' unit='KiB'> > <distances> > <sibling id='0' value='10'/> > <sibling id='1' value='21'/> > <sibling id='2' value='31'/> > <sibling id='3' value='21'/> > </distances> > </cell> > <cell id='1' cpus='4-7' memory='2097152' unit='KiB'> > <distances> > <sibling id='0' value='21'/> > <sibling id='1' value='10'/> > <sibling id='2' value='21'/> > <sibling id='3' value='31'/> > </distances> > </cell> > <cell id='2' cpus='8-11' memory='2097152' unit='KiB'> > <distances> > <sibling id='0' value='31'/> > <sibling id='1' value='21'/> > <sibling id='2' value='10'/> > <sibling id='3' value='21'/> > </distances> > <cell id='3' cpus='12-15' memory='2097152' unit='KiB'> > <distances> > <sibling id='0' value='21'/> > <sibling id='1' value='31'/> > <sibling id='2' value='21'/> > <sibling id='3' value='10'/> > </distances> > </cell> > </numa> > </cpu> > > A <cell> defines a NUMA node. <distances> describes the NUMA distance > from the <cell> to the other NUMA nodes (the <sibling>s). For example, > in above XML description, the distance between NUMA node0 <cell id='0' > ...> and NUMA node2 <sibling id='2' ...> is 31. > > Valid distance value are '10 <= value <= 255'. A distance value of 10 > represents the distance to the node itself. A distance value of 20 > represents the default value for remote nodes but other values are > possible depending on the physical topology of the system. > > When distances are not fully described, any missing sibling distance > values will default to 10 for local nodes and 20 for remote nodes. Nitpick, IIUC, if distance is given for A -> B, then we default B -> A to the same value instead of 20. > Signed-off-by: Wim ten Have <wim.ten.have@xxxxxxxxxx> None the less for the code/design: Reviewed-by: Daniel P. Berrange <berrange@xxxxxxxxxx> Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
