Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Integrated I/O (IIO) Configuration Registers
260
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
14.2.83 PERFCTRLSTS_1
Performance Control and Status Register 1.
2:2
RW
0x0
nosnoopoprden:
Enable No-Snoop Optimization on VC0 reads and VCp reads  
This applies to reads with the following conditions:
   NS=1 AND (TPH=0 OR TPHDIS=1)
1: When the condition is true for a given inbound read request to memory, it 
will be treated as noncoherent (no snoops) reads on Intel
®
QPI.
0: When the condition is true for a given inbound read request to memory, it 
will be treated as normal snooped reads from PCIe* (which trigger a 
PCIRdCurrent or DRd.UC on IDI).
Notes:
If TPH=1 and TPHDIS=0 then NS is ignored and this bit is ignored
VC1 and VCm reads are not controlled by this bit and those reads are always 
non-snoop.
Current recommendation for BIOS is to just leave this bit at default of 0b.
1:1
RW
0x0
read_passing_read_disable:
0:0
RW
0x1
read_stream_policy:
Type:
CFG
PortID:
N/A
Bus:
0
Device:
0Function:0
Bus:
0
Device:
2Function:0-3
Bus:
0
Device:
3Function:0-3
Offset:
0x180
Bit
Attr
Default
Description
Type:
CFG
PortID:
N/A
Bus:
0
Device:
0Function:0
Bus:
0
Device:
2Function:0-3
Bus:
0
Device:
3Function:0-3
Offset:
0x184
Bit
Attr
Default
Description
31:10
RV
-
Reserved.
9:9
RW
0x0
tphdis:
TLP Processing Hint Disable  
When set, writes or reads with TPH=1, will be treated as if TPH=0.
8:8
RW
0x0
dca_reqid_override:
DCA Requester ID Override  
When this bit is set, Requester ID match for DCA writes is bypassed. All writes 
from the port are treated as DCA writes and the tag field will convey if DCA is 
enabled or not and the target information.
7:4
RV
-
Reserved.
3:3
RW
0x0
max_read_completion_combine_size:
Selects the maximum completion combining size.
1: Completions are combined up to 256B
0: Completions are combined up to 128B
Notes:
This bit is no longer used in the RTL. Completions are always combined up to 
the maximum allowed by the Max Payload Size field in the Device Control 
register.
2:0
RV
-
Reserved.
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