- Change the Tx:Rx on-chip RAM allocation ratio based on MTU:
=> 82547: > 8192 18K:22K, else 10K:30K
=> others: > 8192 24K:40K, else 16K:48K
Values derived from Linux driver.
- On the 82547, keep track of how much of the Tx FIFO has been used.
When in half-duplex mode, don't let packets wrap around the FIFO ring
buffer, because that causes the chip to croak. Detect this, stall the
Tx queue, use a timer to wait for the packets to drain from the Tx FIFO,
reset the internal FIFO pointers, and restart the Tx queue. Basic
algorithm (and some magic numbers) derived from FreeBSD and Linux drivers.
d1c33ede84