Socket Id Strapping; Power Impact Of Peci Commands Vs. C-States - Intel Xeon Processor E5-1600 Datasheet

The client address may not be changed after PWRGOOD assertion, until the next power
cycle on the processor. Removal of a processor from its socket or tri-stating a processor
will have no impact to the remaining non-tri-stated PECI client addresses. Since each
socket in the system should have a unique PECI address, the SOCKET_ID strapping is
required to be unique for each socket.
Table 2-17. SOCKET ID Strapping
SOCKET_ID[1] Strap
2.5.3.4 C-states
The processor PECI client may be fully functional in most core and package C-states.
• The Ping(), GetDIB(), GetTemp(), RdPkgConfig() and WrPkgConfig() commands
have no measurable impact on CPU power in any of the core or package C-states.
• The RdIAMSR() command will complete normally unless the targeted core is in a C-
state that is C3 or deeper. The PECI client will respond with a completion code of
0x82 (see
are C3 or deeper.
• The RdPCIConfigLocal(), WrPCIConfigLocal(), and RdPCIConfig() commands will
not impact the core C-states but may have a measurable impact on the package C-
state. The PECI client will successfully return data without impacting package C-
state if the resources needed to service the command are not in a low power state.
— If the resources required to service the command are in a low power state, the
PECI client will respond with a completion code of 0x82 (see
definition). If this is the case, setting the "Wake on PECI" mode bit as described
in
successful completion of the command. The exact power impact of a pop-up to
C2 will vary by product SKU, the C-state from which the pop-up is initiated and
the negotiated PECI bit rate.
Table 2-18. Power Impact of PECI Commands vs. C-states
Command
Ping()
GetDIB()
GetTemp()
RdPkgConfig()
WrPkgConfig()
RdIAMSR()
RdPCIConfigLocal()
WrPCIConfigLocal()
RdPCIConfig()
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
Ground
Ground
V
TT
V
TT
Table 2-22 for definition) for RdIAMSR() accesses in core C-states that
Section 2.5.2.6 can cause a package 'pop-up' to the C2 state and enable
Not measurable
Not measurable
Not measurable
Not measurable
Not measurable
Not measurable. PECI client will not return valid data in core C-state that is C3 or deeper
May require package 'pop-up' to C2 state
May require package 'pop-up' to C2 state
May require package 'pop-up' to C2 state
SOCKET_ID[0] Strap
Ground
V
TT
Ground
V
TT
Power Impact
PECI Client Address
0x30
0x31
0x32
0x33
Table 2-22 for
71