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Linux: New FireWire Stack Update

May 03, 2007, 21:00 (0 Talkback[s])

"Kristian Høgsberg posted an update on the effort to rewrite the Linux kernel FireWire stack explaining, 'as you may know, we've been working on a new FireWire stack over on linux1394-devel. The main driver behind this work is to get a small, maintainable and supportable FireWire stack, with an acceptable backwards compatibility story.' He went on to request the stack's inclusion in the mainline kernel, listing the following highlights: the new FireWire stack 'has been in Fedora rawhide (development branch) and -mm for 3 months, will be shipping in Fedora 7; backwards compatible at the library level, existing user space libraries have been ported to use the new user space interface; less than 8k lines of code compared to 30k lines of code in the old stack, and a similar size reduction in the sizes of the .ko's; no kernel threads, compared to one subsystem thread and one thread per FireWire controller in the old stack; one user space interface to support zero-copy scatter-gather streaming, as opposed to the old stacks 4 (was 5) different streaming interfaces; per-device device files, letting userspace set up more finegrained access control, such as preventing direct access to FireWire storage devices...'"

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