Ognjen Bezanov <ogn...@mailshack.com> wrote: > >I'm trying to see if there is any way I can make Python share data >between two hosts using DMA transfers over a firewire connection, so >avoiding the need for another layer on top such as IPv4 + Python sockets. > >Thanks to some old python bindings which I updated to python 2.6, I can >read any write to the RAM of any firewire connected host within python. >Because it uses DMA (the cpu is not involved in this at all), I can only >specify a physical address within the 4GB ram limit to read from and >write to. >... > From what I've been told so far, it's not possible to do this without >some OS-specific (Linux in this case) syscall. Is this correct?
Correct. User-mode programs cannot find physical addresess, and they cannot lock pages into memory (which is required for DMA). You need the assistance of a driver for this. The driver will find the physical addresses. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
