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SubjectPacket loss with Znyx 4port 10/100
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<TITLE>Packet loss with Znyx 4port 10/100</TITLE>


<P><FONT SIZE=2>I'm running kernel 2.4.0-test9-pre4 on a Dell GX1 (PIII-500) with a Znyx 4port 10/100 card (4 tulip 21143 ethernet controllers onboard).&nbsp; With the ports locked at 10mbps full duplex, and traffic (64byte UDP packets) from our generator running through the box, I am seeing a little under 2% packet loss in shortterm stats gathering (&lt; 10minutes).&nbsp; Decreasing the rate to about 5mbps seems to reduce the loss to 0.&nbsp; Running traffic for extended periods of time (1hr or more - I left it running over the weekend) will show a total loss of about 3-3.5%.</FONT></P>

<P><FONT SIZE=2>I've tried the stock tulip driver, as well as employing the modified tulip driver to take advantage of hardware flow control.&nbsp; No change between the two.</FONT></P>

<P><FONT SIZE=2>I originally thought the problem was due to the card assigning 1 or 2 IRQs to all of the ports, thus raising the possibility of IRQ sharing problems.&nbsp; I then moved the card to the 1st slot, and it was then able to obtain a unique IRQ for each port.&nbsp; After I disabled the system's built-in ethernet (which also claimed an IRQ used by the Znyx card) and restarted the traffic flow, I noticed that the loss decreased about 0.2%.</FONT></P>

<P><FONT SIZE=2>I've also tried replacing the card with no change.</FONT>

<P><FONT SIZE=2>Any ideas?</FONT>

<P><FONT SIZE=2>Cheers!</FONT>

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