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List: linux-kernel
Subject: Re: 2.6.1 Scheduler Latency Measurements (Preemption diabled/enabled)
From: Roger Larsson <roger.larsson () skelleftea ! mail ! telia ! com>
Date: 2004-02-18 21:00:04
Message-ID: 200402182200.04754.roger.larsson () skelleftea ! mail ! telia ! com
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Christoph Stueckjuergen wrote:
>Hi,
>
>I performed a series of measurements comparing scheduler latency of a 2.6.1
>kernel with preemption enabled and disabled on an AMD Elan (i486 compatible)
>with 133 Mhz clock frequency.
OK, then you have worse hardware than I had when I started to measure
latency :-)
> - - - interesting way of trigger and measure deleted - - -
> The results are:
> "loaded" system, 10.000 samples
> average scheduler latency (preemption enabled / disabled): 170 us / 232 us
> minimum scheduler latency (preemption enabled / disabled): 49 us / 43 us
> maximum scheduler latency (preemption enabled / disabled): 840 us / 1063 us
>
> "unloaded" system, 10.000 samples
> average scheduler latency (preemption enabled / disabled): 50 us / 44 us
> minimum scheduler latency (preemption enabled / disabled): 46 us / 41 us
> maximum scheduler latency (preemption enabled / disabled): 233 us / 215 us
>
Robert Love said:
> That said, I would of expected slightly better numbers.
I would say that the numbers are quite good :-)
For comparation check
http://www.gardena.net/benno/linux/audio/
There are some load tests there that you can use
to generate load: disk access, memory pressure, X11, ...
Note that more memory can result in worse latency, longer linked lists
to walk...
/RogerL
--
Roger Larsson
Skellefteċ
Sweden
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