Autoregulate swappiness & inactivation
Andrew Morton <[email protected]> wrote at Thu, 8 Jul 2004 09:44:06 -0700:
Quoted 9 lines
Quoted 2 lines · Con Kolivas
Here is another try at providing feedback to tune the
vm_swappiness.I spent some time yesterday trying to demonstrate performance improvements from those two patches. Using
make -j4 vmlinux with mem=64m
Quoted 7 lines
and
qsbench -p 4 -m 96 with mem=256mand was not able to do so, which is what I expected.
We do need more quantitative testing on this work.
i`ve done some of my favorite under-bridge-crafted tests, so to speak.
the test looked like this:
time find / -xdev | \
bzcat --compress | bzcat --decompress | \ bzcat --compress | bzcat --decompress | \ bzcat --compress | bzcat --decompress | \
cat > /dev/null
The patches applied were Con`s autoswap + autoregulate
it was performed on a p3-600, 10krpm scsi in two following scenarios:
1. mem=48M, swap=off
2.4.20-pre9: 3m20
2.6.7-con: 4m09
2.6.7-vanilla: 4m09
2. mem=32M, swap=on
2.4.20-pre9: 5m37
2.6.7-con: 6m37
2.6.7-vanilla: 7m31
which still leaves 2.4 the leader.
regards, Samium "2.4" Gromoff