Data Sheet

Ethernet Controller I210 —Inline Functions
340
5. Re-initialize the port.
7.6.1.2 Recovery from DMA Parity Error Event
To recover from a parity error condition in the DMA region, the software device driver should issue a
software reset by asserting the CTRL.RST bit as specified in Section 4.3.1 and re-initializing the port.
7.6.1.3 Recovery from LAN Port Parity Error Event
To recover from a parity error condition in the LAN port region, the software device driver should take
the actions depicted in Section 8.24.11 (LANPERRSTS register) according to the ram that failed.
7.7 CPU Affinity Features
7.7.1 Direct Cache Access (DCA)
7.7.1.1 DCA Description
Direct Cache Access (DCA) is a method to improve network I/O performance by placing some posted
inbound writes indirectly within CPU cache. DCA requires that memory writes go to host memory and
then the processor prefetch the cache lines specified by the memory write. Through research and
experiments, DCA has been shown to reduce CPU Cache miss rates significantly.
Figure 7-18. Diagram of DCA Implementation on FSB System
CPU
Cache
Memory
NIC
MCH
D
D
M
M
A
A
W
W
r
r
i
i
t
t
e
e
B
B
I
I
L
L
-
-
D
D
C
C
A
A
M
M
e
e
m
m
o
o
r
r
y
y
W
W
r
r
i
i
t
t
e
e
D
D
C
C
A
A
t
t
r
r
i
i
g
g
g
g
e
e
r
r
e
e
d
d
H
H
W
W
P
P
r
r
e
e
f
f
e
e
t
t
c
c
h
h
C
C
P
P
U
U
d
d
e
e
m
m
a
a
n
n
d
d
r
r
e
e
a
a
d
d