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Re: [lwip-users] lwip whole performance down


From: vincent cui
Subject: Re: [lwip-users] lwip whole performance down
Date: Thu, 17 May 2012 23:19:28 +0000

Hi all:

I found the root cause and got it done. The Ethernet interrupt handler has a 
potential bug .

Thank you for all your help..  
 

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Sylvain Rochet
Sent: 2012年5月17日 18:33
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwip whole performance down

Hi Vincent,


On Thu, May 17, 2012 at 10:15:36AM +0000, vincent cui wrote:
> 
> When lwIP performance goes down, the Ethernet DMA's RX buffer 
> unavailable flag is always set ... don't know why, it seems HW 
> problem.

This is kind of a hazardous way to suspect first a hardware problem before 
checking the software driver.

From here, it looks like a faulty behavior in the DMA interrupt handler of your 
MAC driver.


Sylvain

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