Fast data acquisition

From: Vadim Lebedev (vadim@7chips.com)
Date: Tue Oct 15 2002 - 20:45:15 EST

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Hello,

I'm designing a solution for high speed data acquisition. The solution will
be based on a Pentium class processor running Linux 2.4.x
The data will be acquired over ISA bus using DMA at the rate of 52Mbit per
second and then sent over TCP/IP on Ethernet 100MB connecttion to host
computer.

I wonder how to design a driver for the data acquistion bord that will
minimize data copying.
I have 2 ideas:

1) the application will open the driver and use a sendfile(devicefd,
socketfd, ....) call
2) To have the driver DMA data into the kernel buffer and then calling
sock_sendpage directly from the driver.

Do i need to implement some special functionality in the driver to realize
1) or a sendfile will work with an fd to any character device as source?

Maybe somebody already implement something similar?

Please CC me the responce

Thanks
Vadim

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