Re: [patch] O(1) scheduler, -D1, 2.5.2-pre9, 2.4.17

[Rene Rebe]

Hi.

From: Ingo Molnar <[e-mail]>
Subject: Re: [patch] O(1) scheduler, -D1, 2.5.2-pre9, 2.4.17
Date: Wed, 9 Jan 2002 12:37:46 +0100 (CET)

[...]

> 2.5.2-pre10-vanilla running the test at the default priority level:
> 
>     # ./chat_s 127.0.0.1
>     # ./chat_c 127.0.0.1 10 1000
> 
>     Average throughput : 124676 messages per second
>     Average throughput : 102244 messages per second
>     Average throughput : 115841 messages per second
> 
>     [ system is unresponsive at the start of the test, but
>       once the 2.5.2-pre10 load-estimator establishes which task is
>       interactive and which one is not, the system becomes usable.
>       Load can be felt and there are frequent delays in commands. ]
> 
> 2.5.2-pre10-vanilla running at nice level 19:
> 
>     # nice -n 19 ./chat_s 127.0.0.1
>     # nice -n 19 ./chat_c 127.0.0.1 10 1000
> 
>     Average throughput : 214626 messages per second
>     Average throughput : 220876 messages per second
>     Average throughput : 225529 messages per second
> 
>     [ system is usable from the beginning - nice levels are working as
>       expected. Load can be felt while executing shell commands, but the
>       system is usable. Load cannot be felt in truly interactive
>       applications like editors.
>
> Summary of throughput results: 2.5.2-pre10-vanilla is equivalent
> throughput-wise in the test with your patched kernel, but the vanilla
> kernel is about 100% faster than your patched kernel when running reniced.

Could someone tell a non-kernel-hacker why this benchmark is nearly
twice as fast when running reniced??? Shouldn't it be slower when it
runs with lower priority (And you execute / type some commands during
it)?

[...]
 
> 	Ingo

k33p h4ck1n6
  René

-- 
René Rebe (Registered Linux user: #248718 <http://counter.li.org>)

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