netdev - Re: [PATCH] e1000: Work around 82571 completion timout on Pseries HW

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Date:	Thu, 17 May 2007 08:31:36 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Wen Xiong <wenxiong@...ibm.com>
Cc:	Jeff Garzik <jeff@...zik.org>, Auke Kok <auke-jan.h.kok@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH] e1000: Work around 82571 completion timout on Pseries
	HW

On Wed, 2007-05-16 at 17:11 -0500, Wen Xiong wrote:
>  little history, on PCI-X adapters we did not time dma reads being
> returned to the adapter. On PCIe unfortunately the spec says that
> adapters need to time the dma reads the spec is not specific on the
> range but the timers can range from worst case 50 usecs to 10 ms with
> some adapters supporting upto 50ms. The PCIe spec has approved an ECR
> to the PCIe 1.0a spec that will support the ability to disable the
> timer.  To work aroung the adapter doesn't support ECR.  We need the
> driver to disable the timer. 

You do get more than 10ms delay for DMA replies on pSeries ? Ouch...

Ben.


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