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Date: Wed, 5 Sep 2007 18:48:44 -0700 (PDT)
From: Shriram Janardhan <shriramjanardhan@yahoo.com>
Subject: Gianfar - MPC8541 - tx buffer overrun errors
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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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<div>All,</div>  <div>&nbsp;</div>  <div>I am running 2.6.11 version of the kernel on MPC8541.&nbsp;&nbsp;Have one of the TSECs configured at 100Mbps/Full Duplex.&nbsp; The TSEC MAC is connected to a Marvell Ethernet switch MAC without any PHY in between.&nbsp; MAC level flow control is enabled but no pause frames sent or received.</div>  <div>&nbsp;</div>  <div>I see a high number of transmit buffer overrun errors (tx_fifo_empty errors in the gianfar driver).&nbsp; I don't have NAPI enabled.&nbsp; In addition to other things, I was thinking of enabling NAPI and see if it helps - is there any downside to it??&nbsp; Are there any other parameters that I could tweak to reduce/eliminate the overrun errors??</div>  <div>&nbsp;</div>  <div>Thanks,</div>  <div>Shriram.</div>  <div>&nbsp;</div><p>&#32;
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