[Ocfs2-devel] [PATCH 0/4] Ocfs2 allocation tuning

[Mark Fasheh]

The following patches apply some lessons I've learned during some testing of
a couple non-trivial workloads on Ocfs2.  Roughly speaking, they tune "up"
the default local alloc windowxs, and tune "down" the reservations code a
bit.

I primarily ran two tests - one simulating a large multi-node data-processing
workload, and the multi-threaded writers test, mtwrite at:

http://www.kernel.org/pub/linux/kernel/people/mfasheh/ocfs2/tests/mtwrite.c

All patches were developed and tested on top of the current set of
allocation changes in ocfs2.git (primarily reservations, and the local alloc
fixes we have).  A git branch containing all the patches is available, based
off 2.6.33:

git pull git://git.kernel.org/pub/scm/linux/kernel/git/ocfs2-mark.git disk-alloc

Basically though, this all involved many many test runs (of which I have
lots of data) and a thorough checking of fragmentation levels.  I changed
only one value at a time. Details regarding some of the test runs are within
the specific patch descriptions.
	--Mark

--
Mark Fasheh