On Wednesday 01 March 2006 14:41, Jens Axboe wrote:
> On Wed, Mar 01 2006, Andy Chittenden wrote:
> > with revised patch that does:
> >
> > printk("sg%d: dma=%llx, dma_len=%u/%u, pfn=%lu\n", i,
> > (unsigned long long) sg->dma_address, sg->dma_length, sg->offset,
> > page_to_pfn(sg->page));
>
> That is correct, thanks!
>
> > hda: DMA table too small
> > ide dma table, 255 entries, bounce pfn 1310720
> > sg0: dma=81c8800, dma_len=4096/0, pfn=1296369
>
> Still the same badness here, it's 2kb into a page so straddles two pages
> for one entry.
That's normal if it was in the IOMMU and a merged entry.
You can try iommu=nomerge.
Or maybe the higher layers are passing in physically continuous pages
that get merged? Not too unlikely at boot.
>
> Andi, any idea what is going on here? Why is this throwing up all of a
> sudden??
What is throwing up exactly?
There was a change recently in the merging algorithm, but it shouldn't
cause any bad side effects for correct users of *_map_sg()
-Andi
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