While testing the page placement policy patches on 2.6.12-rc1, I noticed
that aim9 is showing significant slowdowns on page allocation-related
tests. An excerpt of the results is at the end of this mail but it shows
that page_test is allocating 18000 less pages.
I did not check who has been recently changing the buddy allocator but
they might want to run a benchmark or two to make sure this is not
something specific to my setup.
root@monocle:~# grep _test vmregressbench-2.6.11-standard/aim9/log.txt
7 page_test 60.01 4420 73.65439 125212.46 System Allocations & Pages/second
8 brk_test 60.00 1732 28.86667 490733.33 System Memory Allocations/second
9 jmp_test 60.01 252898 4214.26429 4214264.29 Non-local gotos/second
10 signal_test 60.00 5983 99.71667 99716.67 Signal Traps/second
11 exec_test 60.01 788 13.13114 65.66 Program Loads/second
12 fork_test 60.06 986 16.41692 1641.69 Task Creations/second
13 link_test 60.00 6302 105.03333 6617.10 Link/Unlink Pairs/second
root@monocle:~# grep _test vmregressbench-2.6.12-rc1-standard/aim9/log.txt
7 page_test 60.01 3784 63.05616 107195.47 System Allocations & Pages/second
8 brk_test 60.02 1194 19.89337 338187.27 System Memory Allocations/second
9 jmp_test 60.00 252312 4205.20000 4205200.00 Non-local gotos/second
10 signal_test 60.00 3731 62.18333 62183.33 Signal Traps/second
11 exec_test 60.08 762 12.68309 63.42 Program Loads/second
12 fork_test 60.04 864 14.39041 1439.04 Task Creations/second
13 link_test 60.01 4723 78.70355 4958.32 Link/Unlink Pairs/second
--
Mel Gorman
Part-time Phd Student Java Applications Developer
University of Limerick IBM Dublin Software Lab
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