Intel Xeon X3460 BX80605X3460 User Manual

Intel® Xeon® Processor 3400 Series Datasheet, Volume 2

175

14:12

RWDS

1/2h

VN0 - DRS credits
With Isoc enabled this value is expected to be set at 4 to ensure QoS with 

processor.
Allowed values = 0-7 credits

11

RV

0

10:8

RWDS

0/2h

VN0 - Snp credits
Allowed values = 0-7 credits
Snp credits are only needed for debug mode only. This should be set to 0 for 

normal operation. It can be changed to 1 for debug mode.

7

RV

0

6:0

RWDS

66/4Ah

VNA credits
Default is set to 102 (66h), which allows for 1 VN0 credit per message class 

to be assigned with standard headers. 
0 - 127 credits
Additional modifiers on VNA credits.
If VN0 Snp Credits is set to 1, this must be set to one less credit. 
If VN0 DRS credits are set to the recommended isoc value (4), this should be 

set to 33 less credits.