From: Richard Cochran <richardcochran@gmail.com>
To: satpal parmar <systems.satpal@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: PTP + H/W time stamping + CONFIG_PREEMPT_RT_FULL == Oops in slab
Date: Thu, 21 Jun 2012 21:54:28 +0200 [thread overview]
Message-ID: <20120621195428.GC13496@netboy.at.omicron.at> (raw)
In-Reply-To: <CAGgcXb662=PbdJaMff1QfBhW06mYXgNvM1o6snunZMe=Q36Q7A@mail.gmail.com>
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
prev parent reply other threads:[~2012-06-21 19:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-21 14:39 PTP + H/W time stamping + CONFIG_PREEMPT_RT_FULL == Oops in slab satpal parmar
2012-06-21 16:58 ` Ben Hutchings
2012-06-21 19:54 ` Richard Cochran [this message]
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