netdev - Re: MV643xx Ethernet Driver Issue on a Motorola PrPMC-275 board.

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Date:	Thu, 31 Jul 2008 01:56:22 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Chris Larson <clarson@...sta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: MV643xx Ethernet Driver Issue on a Motorola PrPMC-275 board.

On Tue, Jul 29, 2008 at 10:49:09AM -0700, Chris Larson wrote:

> I was wondering if anyone had any advice on an issue a customer of ours 
> is running into.  When they run a series of bandwidth tests, slowly 
> increasing the bandwidth & # of tcp connections to roughly 30Mbit at 
> 4000 connections, their machine panics.  An address passed to 
> dma_unmap_single is beyond lowmem, as though it was corrupted in some 
> fashion.  The address is the data pointer in the ethernet dma 
> descriptors, it pulls a descriptor out of the ring in the packet receipt 
> functions and at that point the address is wrong.  Nowhere in the driver 
> is a descriptor set up with that address, yet the datasheet on the 
> mv643xx doesn't seem to indicate that the dma engine ever writes to the 
> descriptors themselves, only to the data they point to (as you'd 
> expect).  Does anyone have any ideas on this?  I'm afraid that I'm a bit 
> out of my depth on this issue.  The architecture is ppc.

I've never seen this happen.  Which kernel version is this on?
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