From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Wen Xiong <wenxiong@us.ibm.com>
Cc: e1000-devel@lists.sourceforge.net, netdev@vger.kernel.org,
Auke Kok <auke-jan.h.kok@intel.com>,
Jeff Garzik <jeff@garzik.org>
Subject: Re: [PATCH] e1000: Work around 82571 completion timout on Pseries HW
Date: Thu, 17 May 2007 08:31:36 +1000 [thread overview]
Message-ID: <1179354696.32247.231.camel@localhost.localdomain> (raw)
In-Reply-To: <OFF304A49A.2C1F7634-ON872572DD.0079C647-862572DD.0079EE19@us.ibm.com>
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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next prev parent reply other threads:[~2007-05-16 22:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-16 8:53 [PATCH] e1000: Work around 82571 completion timout on Pseries HW Auke Kok
2007-05-16 16:00 ` Jeff Garzik
2007-05-16 22:11 ` Wen Xiong
2007-05-16 22:31 ` Benjamin Herrenschmidt [this message]
2007-05-17 0:43 ` Kumar Gala
2007-05-17 9:01 ` Christoph Hellwig
2007-05-17 13:10 ` Kumar Gala
2007-05-17 14:58 ` Wen Xiong
2007-05-17 21:04 ` Jeff Garzik
2007-05-17 21:44 ` wendy xiong
2007-06-23 8:20 ` Christoph Hellwig
2007-06-23 17:05 ` Kok, Auke
2007-05-18 0:47 ` Jeff Garzik
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