Re: [PATCH] Re: Negative scalability by removal of lock_kernel()?(Was: Strange performance behavior of 2.4.0-test9)

kumon
2000-10-30T09:28:38Z

Andrew Morton writes:
>
> I agree with me. Could you please test the scalability
> of this?

Here is the result, measured on 8-way profusion.

Andrew posted two paches, so called P1 and P2.

Req/s
test10-pre5: 2255 bad performance
----
test9+P2: 5243
test10-pre5+P1: 5187
test10-pre5+P2: 5258

P2 may be a little bit better.

----------
Data summary sorted by the performance:
test8 5287 <-- best performance
test10-pre5+P2: 5258
test9+P2: 5243
test9+mypatch: 5192 <-- a little bit worse
test10-pre5+P1: 5187
test1 3702 <-- no good scalability
test10-pre5: 2255 <-- negative scalability
test9 2193

The value changes within 30-50 seems fluctuations.

--
Computer Systems Laboratory, Fujitsu Labs.
kumon@flab.fujitsu.co.jp