I use DMA to read from PCI.
- The buffer is reserved by kmalloc and aligned to the size of the page
- I limit the transmission to multiples of 8*4 bytes. I use a complete cache line.
- I used direct mode. Now I use chain mode to improve the transfer speed but It's not enough yet.
- I tried with 32, 40 and 48 bytes. When I use 48 bytes the system hangs. I don't see this limitation anywhere.
any suggestions? Has anyone experienced similar problems with DMA?
Thanks a lot in advance.