DBT-2 anticipatory scheduler and filesystem results with 2.6.1

Hi Nick,

I ran some dbt-2 tests against 5 filesystems with 2.6.1-mm4 and 2.6.1. I
see a degradation from 0 to 7% in throughput.  In most cases there
appears to be a significant difference in the i/o wait and user time
(for PostgreSQL) between 2.6.1 and 2.6.1-mm4, where the i/o wait time is
going up.  Thought you might be interested in the results since there
was a tuning patch in 2.6.1-mm3. I have links to more detailed results
(readprofile) here:
	http://developer.osdl.org/markw/fs/project_results.html

but here's a summary:

		% throughput change from 2.6.1 to 2.6.1-mm4
ext2		-5.9%
ext3		-5.1%
jfs		-7.0%
reiserfs	-2.2%
xfs		-0.3%

-- 
Mark Wong - - markw@osdl.org
Open Source Development Lab Inc - A non-profit corporation
12725 SW Millikan Way - Suite 400 - Beaverton, OR 97005
(503) 626-2455 x 32 (office)
(503) 626-2436      (fax)
http://developer.osdl.org/markw/
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