20–User Diagnostics in DOS
Diagnostic Test Descriptions
348
83840-546-00 D
D4
LSO
Verifies the adapter’s Large Send Offload (LSO) sup-
port by enabling MAC loopback mode and transmitting
large TCP packets. As the packets are received back
by QLogic 8400/3400 Series User Diagnostics, they are
checked for proper segmentation (according to the
selected MSS size) and any other errors. The adapter
should not be connected to a network.
D5
EMAC Statistics
Verifies that the basic statistics information maintained
by the chip is correct by enabling MAC loopback mode
and sending Layer 2 packets of various sizes. The
adapter should not be connected to a network.
D6
RPC
Verifies the Receive Path Catch-up (RPC) block by
sending packets to different transmit chains. The pack-
ets traverse the RPC logic (though not the entire MAC
block) and return to the receive buffers as received
packets. This is another loopback path that is used by
Layer 4 and Layer 5 traffic within the MAC block. As
packets are received back by QLogic 8400/3400 Series
User Diagnostics, they are checked for errors. The
adapter should not be connected to a network.
Table 20-2. Diagnostic Tests (Continued)
Test
Description
Number
Name
