linux-kernel - Re: realtime preemption performance difference

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Message-ID: <3f9a31f40709260011i1416d287h5d0da001dd77fbfb@mail.gmail.com>
Date:	Wed, 26 Sep 2007 12:41:57 +0530
From:	"Jaswinder Singh" <jaswinderlinux@...il.com>
To:	hufey <hufeyy@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	dmitry.adamushko@...il.com, a.p.zijlstra@...llo.nl,
	randy.dunlap@...cle.com, efault@....de, akpm@...ux-foundation.org,
	vatsa@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com
Subject: Re: realtime preemption performance difference

hello hufey,

I am not using montavista kernel, I am using standard linux kernel.

Realtime is known by worst case latencies. Ingo and team are claiming
for realtime support so their should be some samples and performance
numbers,

Can someone please share their samples and/or numbers.

Thank you,

Jaswinder Singh.

On 9/25/07, hufey <hufeyy@...il.com> wrote:
> On 9/24/07, Jaswinder Singh <jaswinderlinux@...il.com> wrote:
> > Hi all,
> >
> > I want to check performance difference by using realtime preemption patch :
> >
> > http://www.kernel.org/pub/linux/kernel/projects/rt/
> >
> > Please let me know from where I can download samples to test realtime
> > preemption performance difference.
> >
>
> As far as I know, some embedded linux vendors such as MontaVista
> provide kernel patch to export some interfaces to measure realtime
> performance.
>
> > Can someone please share performance numbers for your hardware:-
> >
> > 1. Interrupt latency
> > 2. Task switching time
> > 3. hard-realtime scheduling latency
> >
> > Thank you,
> >
> > Jaswinder Singh.
> > -
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