hi,
the default MAX_ORDER is 10. as i don't know anything about
page usage, i did some tests to see how it affects performance
(with the infamous kernel compile time).
here it is (all +6m):
1st test 2nd test mean
2 40.153
3 38.543
4 38.065 38.615 38.350
5 36.778 38.696 37.737
6 37.902 37.800 37.851
7 36.990 36.650 36.820
8 37.157 36.379 36.768
9 37.215
10 37.951
11 36.889
12 36.773
13 36.765
14 36.533
15 37.683
so i conclude that the test is inconclusive. only the first
three (MAX_ORDER == [234]) have noticeable difference, but
those must be affected by the shrinked dentry & page cache
hash table size, right?
the machine has 128mb ram, so the maximum MAX_ORDER that really
works is 14 (largest chunk 32mb).
if i use MAX_ORDER = 6 i save one page. so what should i use?
6, 14, or the default (10)?
would somebody care how the chunks used?
imel
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