On Thu, 23 Nov 2006 08:32:52 -0800
Sanjeev Jorapur <[EMAIL PROTECTED]> wrote:

> > 
> > You should then set the same value for pci_set_dma_mask, because then the 
> > IOMMU
> > can help. See both b44 or tg3 drivers, they have to deal with odd size 
> > masks.
> > I don't think you have to do all the bounce buffer work in the driver.
> > 
> 
> We had tried something like this earlier, but found that on some
> platforms (Opteron, IA64), we got kernel panics when the kernel
> ran out of translation entries.

That's a bug, it should be fixed there.  It would make sense to reduce the size
of the Tx queue if not enough translation entries were available.
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