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Re: Au1000 Ethernet Driver using NAPI

Subject: Re: Au1000 Ethernet Driver using NAPI
From: Charles Eidsness <>
Date: Wed, 08 Dec 2004 20:05:19 -0500
Original-recipient: rfc822;
User-agent: Mozilla Thunderbird 0.9 (Windows/20041103)
Pete Popov wrote:
>Very cool, thanks. Is the patch for 2.4 or 2.6?

Hi Pete,

It's for 2.6, I'm not sure if it will work on 2.4.

There are a couple of possible issues with this method that I probably should have mentioned in my first email. Since the Au1000 shares an interrupt for the TX and RX streams I had to lump the two together and as a result there may be an increase in TX latency. Also, the MAC's DMA can only queue up a maximum of 4 packets at a time so depending on how long the processor spends clearing out the queue there may be some buffer overruns. I've experienced neither of these issues but my testing so far has been pretty application specific.


Charles Eidsness wrote:
> Hi All,
> I was having a problem running a streaming audio application on my
> Au1000 processor when the Ethernet port was being bombarded with
> packets. All of the interrupt servicing was hogging my precious
> processing power and there was nothing left for my app. There's a new
> method for writing Ethernet drivers called NAPI which resolves this
> issue (somewhat). I converted the au1000's Ethernet driver to use
> method. If you're interested you can find a patch that applys my
> to the most recent kernel here:
> Cheers,
> Charles

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