From: Thomas Gleixner <tglx@linutronix.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: George Anzinger <george@mvista.com>,
LKML <linux-kernel@vger.kernel.org>,
Doug Niehaus <niehaus@ittc.ku.edu>,
Benedikt Spranger <bene@linutronix.de>
Subject: Re: High resolution timers and BH processing on -RT
Date: Fri, 28 Jan 2005 09:20:10 +0100 [thread overview]
Message-ID: <1106900411.21196.181.camel@tglx.tec.linutronix.de> (raw)
In-Reply-To: <20050128044301.GD29751@elte.hu>
On Fri, 2005-01-28 at 05:43 +0100, Ingo Molnar wrote:
> *
> is this due to algorithmic/PIT-programming overhead, or due to the noise
> introduced by other, non-hard-RT timers? I'd guess the later from the
> looks of it, but did your test introduce such noise (via networking and
> application workloads?).
>
Right, it's due to noise by non-RT timers, which I enforced by adding
networking and applications.
This adds random timer expires and admittedly the PIT reprogramming
overhead is adding portions of that noise.
tglx
next prev parent reply other threads:[~2005-01-28 8:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-28 0:13 High resolution timers and BH processing on -RT Thomas Gleixner
2005-01-28 4:43 ` Ingo Molnar
2005-01-28 8:20 ` Thomas Gleixner [this message]
2005-01-28 8:24 ` Ingo Molnar
2005-01-28 8:30 ` Thomas Gleixner
2005-01-28 8:47 ` Ingo Molnar
2005-01-28 18:34 ` George Anzinger
2005-01-28 18:51 ` Ingo Molnar
2005-01-28 18:53 ` Ingo Molnar
2005-01-31 9:12 ` Thomas Gleixner
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