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Re: Large memory with netbsd 4
On Tue, Aug 05, 2008 at 08:18:54AM -0700, Paul Goyette wrote:
> On Wed, 6 Aug 2008, Simon Burge wrote:
> >>My question is simple, is there any chance that the ammount of memory
> >>can actually crash
> >>the machine ?
> >>Thanks in advance for your answer.
> >You don't give any specifics like architecture and CPU type/model. I've
> >used netbsd-4 with the amd64 port on a machine with 16GB of RAM without
> >any problems.
> Hmmm, I'm running -current on a machine with 8GB of RAM, and had to
> disable the top 4GB to avoid lots of random crashes. IIRC, someone on
> this list indicated that there was an "issue" with DMA bounce buffers
> above the 4GB boundary point.
A specific device may have issues with memory above 4GB, but I don't
think the bus_dma code in general has. I've been running amd64
on systems with more than 4GB without troubles.
> I've actually been watching for any hint of a commit that might address
> this problem so I can turn on the rest of my memory.
> Having said that, I've had no problems running with 4GB (at least, no
> problems related to the amount of memory).
With 4GB enabled, you're likely to use a physical segment above the 4GB limit,
as the PCI bus lives in the top 4GB physical address space.
Manuel Bouyer, LIP6, Universite Paris VI.
NetBSD: 26 ans d'experience feront toujours la difference
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