Ocfs2 allocation tuning
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Cover letter [Ocfs2-devel] [PATCH 0/4] Ocfs2 allocation tuning
Quoted 15 lines · 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:
Quoted 6 lines
git pull
git://git.kernel.org/pub/scm/linux/kernel/git/ocfs2-mark.gitdisk-allocBasically 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.
These patches are now in the merge-window branch of ocfs2.git.
Joel
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"It is not the function of our government to keep the citizen from falling into error; it is the function of the citizen to keep the government from falling into error." - Robert H. Jackson Joel Becker Principal Software Developer Oracle E-mail: joel.becker at oracle.com Phone: (650) 506-8127