Re: [BUG] memory mngt > 2 Gbytes and DMA for the Alpha? pci_iommu.c

[Andrea Arcangeli]

On Wed, May 09, 2001 at 04:12:41PM +0200, Cabaniols, Sebastien wrote:
> Hi lkml,
> 
> There is likely a bug in the management of memory above two Gigabytes and
> DMA in kernel 2.4.4
> (up to ac-6) with the alpha. :-(

remeber why last yaer I was advocating a CONFIG_HIGHMEM option also in
2.4 and not only in 2.2? If we had that now I would tell you "set
HIGHMEM to y until we fix it" and you could use more up to terabyte of
ram in the meantime.

> When I boot the system with mem=2048M, everything is back... network,
> storage...

can you try to set DEBUG_NODIRECT to 1 in pci_iommu.c and then to boot
with mem=2048M, if you can reproduce I should be able to reproduce too.

Andrea