> This is not strictly an RTLinux question, but I hope you can help: we are
> transferring data across the PCI bus, and it seems to be quite slow. The
> manufacturer (Dell) claims that the PCI bus speed is 33 MHz. Am I missing
> something in translating that 33 Mbits/sec? Or should I believe that, since
> it is a 32-bit bus, it's actually 32*33 = 1056 Mbits/sec? Or are only some of
> the 32-bits actually used to transmit data?
The clock is 33 Mhz and the bus is 4 bytes wide, so the transfer rates is
4*33 or 132 megaBYTES/second. Unfortunately you'll only see that speed if
you use host-mastering DMA on the PCI card. Programmed IO is faster than
it is to an ISA card, but not that much faster on PCI.
:-) Wayne
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