From: Carsten Emde <Carsten.Emde@osadl.org>
To: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>,
RT <linux-rt-users@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] [rt-tests] change to cyclictest behavior
Date: Thu, 07 Jan 2010 15:54:34 +0100 [thread overview]
Message-ID: <4B45F5AA.2020100@osadl.org> (raw)
In-Reply-To: <20100107084700.0fa053a3@torg>
On 01/07/2010 03:47 PM, Clark Williams wrote:
> On Thu, 07 Jan 2010 08:23:52 +0100
> Carsten Emde <Carsten.Emde@osadl.org> wrote:
>>>> -S --smp Standard SMP testing (equals -a -t -n -d0),
>>>> same priority on all threads.
>> After having done some tests with a quickly hacked cyclictest version, I
>> have found an issue with including -d0. Apparently, small numbers make
>> life especially difficult for the scheduler; this is why we often used
>> -d1. Specifying -d0 seems a special case where all threads are in sync.
>> Maybe, we may miss some important latency constellations, if we do not
>> let the tasks slightly interfere. In any case, I would like to be able
>> to specify a distance _in addition_ to -S.
>> [..]
> I don't have a problem not having -d in the -S option. I was looking at
> the possibility of synchronous sampling as well so it's probably a good
> idea to keep it separate.
> The main things we want are implied -t, -a and -n.
Yes, let's do it this way.
next prev parent reply other threads:[~2010-01-07 15:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-06 19:04 [RFC] [rt-tests] change to cyclictest behavior Clark Williams
2010-01-06 19:39 ` John Kacur
2010-01-06 21:39 ` Carsten Emde
2010-01-06 22:04 ` Clark Williams
2010-01-06 22:24 ` Carsten Emde
2010-01-06 22:27 ` Clark Williams
2010-01-06 22:50 ` Carsten Emde
2010-01-07 0:30 ` Leyendecker, Robert
2010-01-07 7:09 ` Carsten Emde
2010-01-07 7:23 ` Carsten Emde
2010-01-07 14:47 ` Clark Williams
2010-01-07 14:54 ` Carsten Emde [this message]
2010-01-12 16:59 ` Sven-Thorsten Dietrich
2010-01-12 17:04 ` Clark Williams
2010-01-12 17:13 ` Sven-Thorsten Dietrich
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