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    SubjectRe: [patch] O(1) scheduler, -D1, 2.5.2-pre9, 2.4.17
    From
    Hi.

    From: Ingo Molnar <mingo@elte.hu>
    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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