Chuck Ebbert wrote:
I have a report of random errors when using the atl1 driver
with kernel 2.6.22.1. Could that be a problem fixed by the
recent changes to DMA setup in 2.6.23-rc?
I hope so. As far as we can tell the driver and the NIC itself are doing the
right thing, and the pci layer or chipset is screwing up the 64-bit DMA. This
only manifests when physical memory addresses cross the 4 GB boundary, and as
far as I'm aware atl1 is only used on desktop boards, so we don't have a lot of
testers. If someone wants to buy me and Jay more RAM so we can test it
ourselves, I guess we wouldn't object :)
I favor disabling 64-bit DMA in atl1 until Atheros can track this down in the
lab. If we don't get confirmation that this bug is fixed by the DMA changes, I
think we should revert to 32-bit DMA for 2.6.23. Limiting ourselves to 32-bit
DMA on desktop systems is a lot less bad than allowing arbitrary memory corruption.
-- Chris
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