Re: slow down in 2.6 vs 2.4

[Con Kolivas]

Hi Phy

You said:
Over the last two days I have been struggling with
understanding why 2.6.x kernel is slower than
2.4.21/23 kernels.  I think I have a test case which
demostrates this issue.
make times:

2.4.21:
323.68user 56.07system 6:35.77elapsed 95%CPU
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (3138783major+3818347minor)pagefaults
0swaps

2.6.7-rc3-s63 (SPA scheduler):
334.01user 69.86system 7:01.47elapsed 95%CPU
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (13301major+6931745minor)pagefaults
0swaps

2.6.7-rc3:
336.17user 68.41system 7:02.47elapsed 95%CPU
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (13301major+6931745minor)pagefaults
0swaps


----
Your 2.4 compile is showing a massive number of major page faults. Just how big
is this compile you do? Can you try running the 2.6 compile with 

echo 100 > /proc/sys/vm/swappiness

Con

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