From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: linuxppc-dev@ozlabs.org, sonnyrao@us.ibm.com,
Anton Blanchard <anton@samba.org>,
miltonm@bga.com
Subject: Re: 2.6.37-git17 virtual IO boot failure
Date: Wed, 19 Jan 2011 17:06:18 +1100 [thread overview]
Message-ID: <1295417178.2148.131.camel@pasglop> (raw)
In-Reply-To: <20110119004824.GA20441@us.ibm.com>
On Tue, 2011-01-18 at 16:48 -0800, Nishanth Aravamudan wrote:
>
> Ben, if you're ok with waiting to see if Milton or Sonny have any
> ideas,
> I'd like to hold off on asking for a revert. In the case they do, I'll
> be able to test and send out any proposed fix rapidly.
I don't believe this specific error is causing the lockup, I think we
only hit a spurrious message on devices that don't have DMA capabilities
in the first place. (But I may be wrong, I'll wait for you guys to dig
more or I'll have a look myself tomorrow if I manage to get out of
meetings).
So there's another problem with SCSI tho it -could- also be a DMA issue,
hard to tell at this point.
BTW. I'm not too happy with those defaults set to 64-bit. Probably not
an issue until your other patches go in, but some devices like veth
cannot do 64-bit DMA. I think we should default to 32-bit in the VIO
base code and explicitely enable 64-bit DMA from drivers that support it
(in theory vscsi but I haven't verified the implementation).
Cheers,
Ben.
next prev parent reply other threads:[~2011-01-19 6:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-18 1:31 2.6.37-git17 virtual IO boot failure Anton Blanchard
2011-01-18 22:47 ` Nishanth Aravamudan
2011-01-19 0:48 ` Nishanth Aravamudan
2011-01-19 6:06 ` Benjamin Herrenschmidt [this message]
2011-01-19 22:26 ` Nishanth Aravamudan
2011-01-19 4:06 ` Benjamin Herrenschmidt
2011-01-19 4:37 ` Nishanth Aravamudan
2011-01-19 4:54 ` Benjamin Herrenschmidt
2011-01-29 22:22 ` Anton Blanchard
2011-01-29 22:24 ` [PATCH 1/5] powerpc/numa: Only use active VPHN count fields Anton Blanchard
2011-01-29 22:26 ` [PATCH 2/5] powerpc/numa: Check for all VPHN changes Anton Blanchard
2011-01-29 22:28 ` [PATCH 3/5] powerpc/numa: Add length when creating OF properties via VPHN Anton Blanchard
2011-01-29 22:35 ` [PATCH 4/5] powerpc/numa: Disable VPHN on dedicated processor partitions Anton Blanchard
2011-01-29 22:37 ` [PATCH 5/5] powerpc/numa: Fix bug in unmap_cpu_from_node Anton Blanchard
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