Dieter Stüken <[email protected]> writes:
[can you please not always drop me from cc with each reply?]
Dieter Stüken <[email protected]> writes:
> OK, here are my last results for today:
>
> using "iommu=allowed" did not work. System freezes during initialization
> of the PDC20318, which is on the external PCI bus.
>
> But swiotlb=force works well!
This means your PCI bridge doesn't support addresses >4GB.
> The pci-gart.c patch seems to disable dma.
Only DMA for addresses >4GB.
> Is this the DMA my PCI devices
> perform them self? As I learned, they may perform DMA even above 4g if all
> works well. Thus I may be happy without any IOMMU. As I saw my system working
> even without this patch, I will turn back to the original 2.6.15-rc7 an continue
> running this torture test during this night.
The patch should perform slightly better than swiotlb=force
because it will only force bounce buffering for addresses >4GB.
If your torture test involves more than 64MB of IO in flight
you might also need to increase the bounce buffer area
with swiotlb=128M or somesuch.
-Andi
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