|| ||Werner Almesberger <email@example.com>|
|| ||Active Block I/O Scheduling System (ABISS), version 7|
|| ||Mon, 14 Mar 2005 11:27:55 -0300|
|| ||firstname.lastname@example.org, email@example.com|
The Active Block I/O Scheduling System (ABISS) is an extension of the
hard-disk storage subsystem of Linux, whose main purpose is to provide
a guaranteed reading and (eventually) writing bit rate to applications.
ABISS is conducted by Philips Research in Eindhoven, the Netherlands
This release upgrades ABISS to the 2.6.11 kernel, brings some major
cleanup and introduces experimental support for writing with a
guaranteed rate. The highlights:
- the "allocator" functionality has been completely removed. It
represented a very complicated way for doing things that can be
done much more efficiently and cleanlier in the file system driver,
complicated the inner workings of ABISS, and wasn't of much use in
its present state anyway.
- removed the abiss_detach message, which was a no-op
- this release adds an experimental mechanism for delayed allocation
of file blocks. In its current form, this is mainly intended for
exploring performance aspects, and may have yet undiscovered
fascinating bugs. This may also be of interest for a broader
audience, hence the cross-posting to linux-fsdevel.
- ABISS now tries to guarantee the accepted data rate also when
writing. For now, this only works for FAT and ext2, and when delayed
allocations are enabled. All this is still very experimental and
only works most of the time.
For additional information, please have a look at
/ Werner Almesberger, Buenos Aires, Argentina firstname.lastname@example.org /
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