netdev - Re: PTP + H/W time stamping + CONFIG_PREEMPT_RT

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Message-ID: <20120621195428.GC13496@netboy.at.omicron.at>
Date:	Thu, 21 Jun 2012 21:54:28 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	satpal parmar <systems.satpal@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: PTP + H/W time stamping + CONFIG_PREEMPT_RT_FULL == Oops in
 slab

I suspect this isn't a time stamping bug, but rather that the time
stamping code just triggers the issue. My own experience has been that
preempt_rt on arm is quite shaky.

On Thu, Jun 21, 2012 at 08:09:11PM +0530, satpal parmar wrote:
> I am not sure if this is the right mailing list. If anyone know better
> forum please direct me to that.  Appreciate your patience and time.

Maybe lkml or rt-users would be better.

However, there are really too many variables, and I recommend first
narrowing the problem down. Here are a few ideas.

1. use a mainline kernel plus rt patch (without vendor/custom changes)
2. try to trigger issue without using ptpd2 (like stress testing)
3. write a simple test case (like sending a single PTP sync) and
   instrument your kernel

Good luck,
Richard

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