Rob,
My reply was never got out on mailing list; I don’t know why so here I am 
forwarding it.

-----Original Message-----
From: Dave, Tushar N 
Sent: Wednesday, May 01, 2013 1:57 PM
To: Rob
Cc: e1000-devel; Kirsher, Jeffrey T
Subject: RE: [E1000-devel] [Fwd: e1000: TX Unit hangs [PATCH]]

>-----Original Message-----
>From: Jeff Kirsher [mailto:[email protected]]
>Sent: Wednesday, May 01, 2013 3:22 AM
>To: e1000-devel
>Cc: Rob
>Subject: [E1000-devel] [Fwd: e1000: TX Unit hangs [PATCH]]
>
>-------- Forwarded Message --------
>From: Rob <[email protected]>
>Subject: e1000: TX Unit hangs [PATCH]
>Date: Tue, 5 Mar 2013 18:55:48 -0500
>
>The e1000 driver in the latest kernel tree still experiences TX unit 
>hangs on some amd64 systems, particularly the SunFire x4500. To work 
>around this, I've made a simple patch based on the latest driver 
>available on sourceforge that adds the ignore_64bit_dma option.
>Setting this option fixes the tx_unit_hang problem on these machines.
>
>I'm sorry I'm not fully familiar with the way kernel development works, 
>and I hope I am sending this to the right person for inclusion.
>I hope it's ok that it's not a proper git patch - it's tiny and I don't 
>care about attribution.

Rob,

I am aware of this but use of module parameter as an workaround is not accepted 
upstream. 
The alternative is to add pci quirk for these amd64 SunFire x4500 systems. We 
will look into this and see if it is the right alternative.

-Tushar
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