From: Chris Larson <clarson@mvista.com>
To: netdev@vger.kernel.org
Subject: MV643xx Ethernet Driver Issue on a Motorola PrPMC-275 board.
Date: Tue, 29 Jul 2008 10:49:09 -0700 [thread overview]
Message-ID: <488F5815.9020402@mvista.com> (raw)
Greetings,
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.
Thanks.
--
Chris Larson
clarson at kergoth dot com
clarson at mvista dot com
Software Engineer
MontaVista Software, Inc.
next reply other threads:[~2008-07-29 17:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-29 17:49 Chris Larson [this message]
2008-07-30 23:56 ` MV643xx Ethernet Driver Issue on a Motorola PrPMC-275 board Lennert Buytenhek
2008-07-31 16:44 ` Chris Larson
2008-07-31 17:48 ` Lennert Buytenhek
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