On our KNL B0 I'm seeing some irregularities in the MCDRAM performance when running Stream in SNC-4 mode.
I'm running Stream with 16 threads all bound to either domain 0, 1, 2, or 3 and memory bound to just one of the
four MCDRAM domains (4,5,6,7). Below is a table of the results showing memory bandwidth in MB/sec, where
the thread domain used is specified on the left the MCDRAM domain on the top of the table.

Domain 4 never achieves more than 73 GB/s while the other domains (5,6,7) all reach 112 GB/s.

			MCDRAM NUMA Domain
		4	5	6	7
	0	73,306	84,053	107,483	55,978
Thread Domain	1	64,837	112,380	55,521	77,765
	2	63,575	67,508	111,569	77,957
	3	65,506	102,203	76,131	111,617

numactl -H shows that nodes 0,1,2,3 are associated with the DDR and 16 cores each
while nodes 4,5,6,7 are MCDRAM nodes with no associated processors. However the
following nodes are closest:
    Node 4 -> Node 0
    Node 5 -> Node 1
    Node 6 -> Node 2
    Node 7 -> Node 3