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From: Jan Kiszka <jan.kiszka@domain.hid>
To: Karl Reichert <Karl-Trampe@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] high latency with Intel Core 2 Duo
Date: Thu, 10 May 2007 18:16:33 +0200	[thread overview]
Message-ID: <46434561.2090309@domain.hid> (raw)
In-Reply-To: <20070510120938.307800@domain.hid>

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Karl Reichert wrote:
> Hello,
> 
>  I'm using an Intel Core 2 Duo at work and an AMD XP3000+ at home. I installed Xenomai 2.3.1 with nearly same configuration at both and run the xeno-test. I get 10 times higher latency with Core 2 Duo. How is it possible? May the SMP be the reason?

SMP surely increases latencies (more synchronisation overhead), but the
tests you ran were also far to short for a thorough comparison. 2 us
worst-case is far too good, even on high end. Also 20 us on loaded SMP
boxes may not hold. Leave the test running for a longer period ("-T"
parameter, I think).

Jan


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  reply	other threads:[~2007-05-10 16:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-10 12:09 [Xenomai-help] high latency with Intel Core 2 Duo Karl Reichert
2007-05-10 16:16 ` Jan Kiszka [this message]
2007-05-10 16:28   ` Gilles Chanteperdrix
2007-05-11 11:24     ` Karl Reichert
2007-05-11 13:23       ` Gilles Chanteperdrix
2007-05-14 11:20       ` Karl Reichert

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