Hi Shriram,
Try to increase the DEFAULT_TX_RING_SIZE parameter in gianfar.h.
Enabling NAPI mechanism should have no effect on transmission side.
Cheers
--
sj
________________________________
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Shriram Janardhan
Sent: jeudi 6 septembre 2007 03:49
To: linuxppc-embedded@ozlabs.org
Subject: Gianfar - MPC8541 - tx buffer overrun errors
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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