Speed of plb_temac 3.00 on ML403

[Ming Liu]

Dear Rick,
Now I turn to the Temac v3 core. Also I have included all the features 
which could improve the network performance. However unfortunately the 
performance is also bad, even worse than the old cores. (The RX number is 
worse than before.) I noticed that the parameters in the new driver are 
much different with the ones in the old drivers. They are listed below.

>The numbers I quoted were using the TCP_SENDFILE option of netperf, and 
also using the plb_temac_v3 core, which has checksum offload and some other 
features that help performance.  Given the core you're using, your RX 
numbers are probably about right (assuming you're not using jumbo frames).  
Your transmit number looks low, though.  Perhaps you can try tuning the 
packet threshold (e.g., less interrupts - try 8 instead of 1) and the 
waitbound (use 1) in adapter.c.  Also, how many buffer descriptors are 
being allocated in adapter.c?

In the new driver, the threshold and waitbound are as (by default when BSP 
generated by EDK):
#define DFT_TX_THRESHOLD  16
#define DFT_TX_WAITBOUND  1
#define DFT_RX_THRESHOLD  2
#define DFT_RX_WAITBOUND  1
Also the buffer descriptors are 
#define XTE_SEND_BD_CNT 256
#define XTE_RECV_BD_CNT 256
when booting, it shows the buffer descriptor number is 0x8000.

Sorry that I cannot understand the mechanism of the network driver. So I 
still cannot make sure what's the physical meaning of a parameter and how a 
parameter inside the adapter.c will affect the performance. So if possible 
could you please send me your adaptor.c file which could generate a high 
performance? I want to have a deep research on these parameters.

Of course, your precious suggestion is also appreciated. :-)

BR
Ming

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