netdev - Re: [PATCH] Fix e100 on systems that have cache incoherent DMA

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Date:	Wed, 12 Sep 2007 16:11:21 -0400
From:	David Acker <dacker@...net.com>
To:	James Chapman <jchapman@...alix.com>
CC:	Jeff Garzik <jgarzik@...ox.com>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Milton Miller <miltonm@....com>, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net,
	Scott Feldman <sfeldma@...ox.com>
Subject: Re: [PATCH] Fix e100 on systems that have cache incoherent DMA

James Chapman wrote:
> David Acker wrote:
>> Jeff Garzik wrote:
>>> pktgen outputs for the various cases modified/unmodified[/others?] 
>>> would be nice, if you have a spot of time.
>>>
>>>     Jeff
>>
>> I am not familiar with pktgen but I seem to have it working for a 
>> simple test.
>> I edited the 1-1 example from 
>> ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/ 
>> .  The results with and without the patch are below. 
> 
> It looks like you ran pktgen on the embedded system, which exercised 
> only the transmit path. Auke indicated that the lockup was in the RU. 
> Have you run pktgen on a test system to fire packets at the embedded 
> system at max rate? Also test what happens when you fire packets in both 
> directions simultaneously.
> 
It appears that running pktgen between my pc and the embedded device at the same time eventually hangs the RU.  I will 
be looking into this failure in detail and report back when I know more.  Thanks for bearing with me on this!
-Ack
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