latencytest for PPC?

latencytest for PPC?

[MPH Kernel]

Hi,

Anyone have a latency testing tool for PPC?
The latest working version I have is latencytest 0.42, but it
never detects any xruns (where alsa does). So I'm suspicious
of it's output.

latencytest 0.5.5 won't work for PPC. It depends on RTC stuff
not present in the gen_rtc module.

Thanks,
	Martin


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RE: latencytest for PPC?

[Giuliano Pochini]

On 18-Oct-2004 MPH Kernel wrote:
> Hi,
>
> Anyone have a latency testing tool for PPC?
> The latest working version I have is latencytest 0.42, but it
> never detects any xruns (where alsa does). So I'm suspicious
> of it's output.

I think you can use aplay as-is... just choose a very short
buffer size to make long latencies cause an xrun.


> latencytest 0.5.5 won't work for PPC. It depends on RTC stuff
> not present in the gen_rtc module.

Perhaps someone already added the required features to make
latencytest work, but I'm not sure. Search in the archives.


--
Giuliano.


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Re: latencytest for PPC?

[Martin Habets]

Takashi,

I'm looking into adding RTC_PIE support to the genrtc driver,
to get latencytest working.

I noticed you added rtc_register and rtc_control to rtc.c for this.
But why didn't you add another ioctl in stead?

Just wondering. Thanks,
     Martin

On Mon, Oct 18, 2004 at 01:37:25PM +0100, MPH Kernel wrote:
> Hi,
> 
> Anyone have a latency testing tool for PPC?
> The latest working version I have is latencytest 0.42, but it
> never detects any xruns (where alsa does). So I'm suspicious
> of it's output.
> 
> latencytest 0.5.5 won't work for PPC. It depends on RTC stuff
> not present in the gen_rtc module.
> 
> Thanks,
> 	Martin


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Re: latencytest for PPC?

[Takashi Iwai]

At Mon, 18 Oct 2004 23:06:25 +0100,
Martin Habets wrote:
> 
> Takashi,
> 
> I'm looking into adding RTC_PIE support to the genrtc driver,
> to get latencytest working.
> 
> I noticed you added rtc_register and rtc_control to rtc.c for this.
> But why didn't you add another ioctl in stead?

Sorry I don't understand your question.  rtc_register() and
rtc_control() is a kind of replacement of open/ioctl for the kernel
modules.  It doesn't add any new functionalities.

I guess genrtc won't work properly for latency tests.  RTC was used as
a high frequenct interrupt source, but genrtc doesn't provide the
interrupt fine enough.

If you need to use the soundcard's interrupt, keep the Benno's
original version (0.42).  In this case, you won't get stack traces,
though.


ciao,

Takashi


> Just wondering. Thanks,
>      Martin
> 
> On Mon, Oct 18, 2004 at 01:37:25PM +0100, MPH Kernel wrote:
> > Hi,
> > 
> > Anyone have a latency testing tool for PPC?
> > The latest working version I have is latencytest 0.42, but it
> > never detects any xruns (where alsa does). So I'm suspicious
> > of it's output.
> > 
> > latencytest 0.5.5 won't work for PPC. It depends on RTC stuff
> > not present in the gen_rtc module.
> > 
> > Thanks,
> > 	Martin
> 


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Re: latencytest for PPC?

[Lee Revell]

On Mon, 2004-10-18 at 08:37, MPH Kernel wrote:
> Hi,
> 
> Anyone have a latency testing tool for PPC?

Untested on PPC but should work:

http://www.ussg.iu.edu/hypermail/linux/kernel/0409.1/0665.html

Lee



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Re: latencytest for PPC?

[Martin Habets]

On Tue, Oct 19, 2004 at 05:20:27PM -0400, Lee Revell wrote:
> Untested on PPC but should work:
> 
> http://www.ussg.iu.edu/hypermail/linux/kernel/0409.1/0665.html

Well, hardly! The code is in arch/i386 and rtc.c, neither of which are
available for PPC. I don't see how to port this either.

-- 
Martin


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Re: latencytest for PPC?

[Lee Revell]

On Wed, 2004-10-20 at 13:54, Martin Habets wrote:
> On Tue, Oct 19, 2004 at 05:20:27PM -0400, Lee Revell wrote:
> > Untested on PPC but should work:
> > 
> > http://www.ussg.iu.edu/hypermail/linux/kernel/0409.1/0665.html
> 
> Well, hardly! The code is in arch/i386 and rtc.c, neither of which are
> available for PPC. I don't see how to port this either.

HA!  My mistake...

Lee



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