Intel PRO/1000 NIC

[Lisong Xu]

Hello,

I am sending UDP data from one PC to another PC directly through a cross
cable. The NIC of sender is Intel® PRO/1000 MT Server Adapter, and the NIC
of receiver is on-board Intel PRO/1000 (Dell PowerEdge 1600SC).

After tuning the kernel and driver parameters, the sender can send data at
1Gbps. But the receiver can only receive data at 620Mbps. (see the following
ifconfig messages, 30 seconds test)

*********** Sender *******************
eth1      Link encap:Ethernet  HWaddr 00:07:E9:17:84:36
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:111 errors:0 dropped:0 overruns:0 frame:0
          TX packets:418072 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:30000
          RX bytes:26193 (25.5 Kb)  TX bytes:3759596626 (3585.4 Mb)
          Interrupt:24 Base address:0xccc0 Memory:fcd00000-fcd20000
**************Receiver***********************
eth0      Link encap:Ethernet  HWaddr 00:C0:9F:1E:3A:46
          inet addr:192.168.1.101  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:261355 errors:156688 dropped:156688 overruns:156688
frame:0   <---- Look here!!!!!
          TX packets:97 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:30000
          RX bytes:2350019728 (2241.1 Mb)  TX bytes:22821 (22.2 Kb)
          Interrupt:11 Base address:0xecc0 Memory:fe100000-fe120000
***************************************************

My questions is why so many packets are "errors, dropped, overruns". I have
adjusted the "TxDescriptors, RxDescriptors, RxIntDelay,
RxAbsIntDelay, TxIntDelay, TxAbsIntDelay" for different values, but always
got similar result.

Maybe here is not the right email list to send, but I am really frustrated
with this problems, and hope to get some suggestions from the experts
here.Any suggestion is really appreciated!

Lisong





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