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SubjectRe: UP 2.2.18 makes kernels 3% faster than UP 2.4.0-test12
On Monday 11 December 2000 11:46, Alan Cox wrote:
> Its an interesting demo that 2.4 has some performance problems since 2.2
> is slower than 2.0 although nowdays not much.

Results for SMP 2.2.18 vs SMP 2.4.0-test12 are in.
I repeated my earlier tests on a much faster dual P-III machine.

Executive summary: SMP 2.4.0 is 2% faster than SMP 2.2.18.

Although I made the following changes in the test procedure, these
tests for 2.2.18 and 2.4.0-test12 were held under identical conditions.

I used make -j3 bzImage for these tests on this SMP machine.
The test machine is a dual P-III (733 Mhz), 256MB, IDE.

I ran X and KDE 2.0 during the tests to provide a greater though
reproducable load on the tested kernel.

The 2.2.18 kernel used was the final 2.2.18.

The 2.4.0-test12 is still 2.4.0-test12-pre7 since test12(final)
does not yet build with reiserfs. Team Reiser is working on this.

Here are the numbers I got. Again, three runs each were done.
Task: make -j3 bzImage for 2.4.0-test12-pre7 kernel tree.
Numbers are seconds to build.

1 2 3 ave.
143 143 143 143 Running 2.2.18 SMP
140 140 140 140 Running 2.4.0-test12-pre7 SMP

The numbers are very repeatable, as you can see.

This time, 2.4.0-test12 wins by 2%. Recounts can be performed
by anyone, anytime.

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