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GigMAC-PMC and PCI
GigPMC Switch Board and Driver Users Manual
DSS NETWORKS, INC. Version: 2.6 Page: 34
dmUtil -m eth0 # displays DP83820 MAC controller registers
dmUtil -p eth0 # displays gigabit (phy) transceiver registers
dmUtil -e eth0 # displays eeprom
dmUtil -a eth0 # displays mac address
dmUtil -ms eth0 # displays mac stats (Intel only)
LOOPBACK PERFORMANCE TESTING
1. Edit 'Makefile'
2. Un-comment the following define:
CFLAGS += -DNS_FRAME_TEST -DIN_FRAME_TEST
3. Save file, unload and reload driver using procedures described above.
4. Use "ifconfig" command to bring up Ethernet interface.
5. Run the following command from the 'util' directory:
./dmUtil -l eth1 # loopback eth0, eth1, etc.
6. View statistics using dmUtil command as follows:
./dmUtil -s eth1 1 # second arg=1 zeroes statistics after gathering
Note: The driver must be compiled without "-DNS_FRAME_TEST" for normal
operation.
Jumbo frames: The mtu size can be increased using the ifconfig utility, as
follows:
# ifconfig <interface-name> mtu <mtu-size>
Example: ifconfig eth0 mtu 3000
Note: Use of jumbo frames is not recommended as it is not IEEE standard and many
switches do not support the forwarding of jumbo frames. It also has to be enabled and
negotiated on both ends of the connection and in today’s faster systems, using jumbo
frames offers little performance improvement and may only be useful in closed
application-specific networks.