Gianfar - MPC8541 - tx buffer overrun errors

[Shriram Janardhan]

All,
   
  I am running 2.6.11 version of the kernel on MPC8541.  Have one of the TSECs configured at 100Mbps/Full Duplex.  The TSEC MAC is connected to a Marvell Ethernet switch MAC without any PHY in between.  MAC level flow control is enabled but no pause frames sent or received.
   
  I see a high number of transmit buffer overrun errors (tx_fifo_empty errors in the gianfar driver).  I don't have NAPI enabled.  In addition to other things, I was thinking of enabling NAPI and see if it helps - is there any downside to it??  Are there any other parameters that I could tweak to reduce/eliminate the overrun errors??
   
  Thanks,
  Shriram.
   

       
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