Help with Polling Mode

[Benoit Parrot]

Hi,

I used click-1.3pre1 and yes I did use the appropriate kernel patch.
I also took a look at the current cvs version to see if anything would help.

After looking at the tulip modified driver code, something caught my eye
in the patched kernel 2.4.18 drivers/net/tulip/interrupt.c line 731.
Function: tulip_tx_clean()
731:734
+#if 0
+	if (tp->cur_tx - dirty_tx < TX_RING_SIZE - 2)
+		netif_wake_queue(dev);
+#endif

Since the behavior seem to suggest the NIC was going to sleep for some reason it made sense something was missing to wake it up. 

I finally got it to work in Polling mode by re-enabling this piece of the code and rebuilding the kernel.

This might not be the cleanest way to fix it but it works.

By the way I had try this on two totally different hardware installs:
1) Dell P3 600Mhz with two Linksys LNE100 tx
2) Force Single Board Computer P3-1200Mhz with a Ramix PMC663J (Dual Tulip NIC)

They both experienced the same behavior without my fix and both work correctly with it.

If you can comment on how to better fix this I would be glad to try it.

Thanks for your reply.

Benoit

-----Original Message-----
From: Eddie Kohler [mailto:kohler at icir.org]
Sent: Thursday, April 24, 2003 6:09 PM
To: Benoit Parrot
Cc: click at amsterdam.lcs.mit.edu
Subject: Re: Help with Polling Mode 


Hi Benoit,

> I am trying to reproduce your forwarding setup in order to get similar performance.
> 
> Here is my setup:
> 
> P3-600Mhz 
> 2 Linksys LNE100TX ver 5.1 (DEC tulip clone)
> Linux 2.4.18 straight from kernel.org (I have tried both with SMP on and off)

Did you patch the Linux 2.4.18 with our patch? (You did say 'straight from
kernel.org'...)

And which version of Click?

Eddie