realtime preemption performance difference

realtime preemption performance difference

[Jaswinder Singh]

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.

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.

Re: realtime preemption performance difference

[hufey]

On 9/24/07, Jaswinder Singh <jaswinderlinux@gmail.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.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>

Re: realtime preemption performance difference

[Jaswinder Singh]

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@gmail.com> wrote:
> On 9/24/07, Jaswinder Singh <jaswinderlinux@gmail.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.
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
> >
>

Re: realtime preemption performance difference

[Ankita Garg]

Hi Jaswinder,

On Wed, Sep 26, 2007 at 12:41:57PM +0530, Jaswinder Singh wrote:
> 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,
> 

You can obtain several -rt testcases from the RT wiki:
http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks 
for measuring scheduling latencies, priority preemption, signaling latencies, etc 
and other important information on the patchset.

Hope this helps!

> Can someone please share their samples and/or numbers.
> 
> Thank you,
> 
> Jaswinder Singh.
> 
> On 9/25/07, hufey <hufeyy@gmail.com> wrote:
> > On 9/24/07, Jaswinder Singh <jaswinderlinux@gmail.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.
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > Please read the FAQ at  http://www.tux.org/lkml/
> > >
> >
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

-- 
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs, 
Bangalore, India   

Re: realtime preemption performance difference

[Ankita Garg]

Hi Jaswinder,

On Mon, Sep 24, 2007 at 05:18:01PM +0530, Jaswinder Singh 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.
> 

You can obtain several -rt testcases from the RT wiki:
http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks
for measuring scheduling latencies, priority preemption, signaling latencies, etc
and other important information on the patchset.

Hope this helps!

> 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.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

-- 
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs, 
Bangalore, India