Hitachi Compute Blade 2000 User Manual page 1427

When setting a processor group or scheduling mode with 4-blade SMP

configuration, follow (a) and (b) below. If you do not follow those requirements for
setting, performance between logical processors in the same LPAR might be
extremely different, which might cause an OS on the LPAR to fail.
(a) Processors in the socket must belong to the same processor group.
(b) Scheduling mode of processors in a processor group must be the same, either
dedicated mode or share mode.
Example of recommended LPAR configuration with 4-blade SMP

+------------------------------------------------------------------------------+
|+- Physical Processor Configuration -----------------------------------------+|
|| Processor# 0 1
|| Blade# 4 4
|| Socket# 0 0
|| Core# 0 1
|| Thread# 0 0
|| State ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT||
|| Status HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG||
|| Group# 0 0
|| Schedule S S
(a) Processors in the
socket must belong to the
same processor group.
Example of not-recommended LPAR configuration with 4-blade SMP

+------------------------------------------------------------------------------+
|+- Physical Processor Configuration -----------------------------------------+|
|| Processor# 0 1
|| Blade# 4 4
|| Socket# 0 0
|| Core# 0 1
|| Thread# 0 0
|| State ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT ACT||
|| Status HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG HIG||
|| Group# 0 0
|| Schedule D D
(a) Processors belonging
to Group #0 and Group #1
are mixed in socket #0.
When using LPAR migration function with 4-blade SMP
configuration, configure both the source and destination
satisfying requirements (a) and (b).
2 3 4 5 6 7 8 9 10 11 12 13 14 15||
4 4 4 4 4 4 4 4
0 0 0 0 1 1 1 1
2 3 4 5 0 1 2 3
0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 1
S S S S D D D D
(b) Scheduling mode of processors in a
processor group must be the same,
either dedicated mode or share mode.
2 3 4 5 6 7 8 9 10 11 12 13 14 15||
4 4 4 4 4 4 4 4
0 0 0 0 1 1 1 1
2 3 4 5 0 1 2 3
0 0 0 0 0 0 0 0
0 0 1 1 1 1 1 1
D D D D S S S S
(b) Dedicated mode and
shared mode are mixed in
Group #1.
1376
4 4 4 4 4 4||
1 1 2 2 2 2||
4 5 0 1 2 3||
0 0 0 0 0 0||
1 1 2 2 2 2||
D D S S S S||
4 4 4 4 4 4||
1 1 2 2 2 2||
4 5 0 1 2 3||
0 0 0 0 0 0||
1 1 2 2 2 2||
S S S S S S||