linux-kernel - Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

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Date:	Wed, 6 Feb 2008 20:41:49 +0100
From:	"Remy Bohmer" <linux@...mer.net>
To:	michael <trimarchi@...dalf.sssup.it>
Cc:	"Haavard Skinnemoen" <hskinnemoen@...el.com>,
	fabio@...dalf.sssup.it, "Andrew Victor" <linux@...im.org.za>,
	"Chip Coldwell" <coldwell@...hat.com>,
	"Marc Pignat" <marc.pignat@...s.ch>,
	"David Brownell" <david-b@...bell.net>,
	linux-kernel@...r.kernel.org, "Alan Cox" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

Hello Michael,

> the serial driver works fine. The problem seems to be related to the
> tclib, when I use it as a clocksource.

tclib as a clocksource should be no problem on Preempt-RT, do not use
it as clockevent device, it will not work properly on preempt-rt on
at91* yet, especially with the NO_HZ config.

> The numbers of overruns depends on the type of
> files too. It is possible?

I am still very curious to your (RT-) thread-prio layout. The problems
you mention can also be caused by a weird configuration of these
threads on preempt-rt.

Remy


2008/2/6, michael <trimarchi@...dalf.sssup.it>:
> Hi,
>
> the serial driver works fine. The problem seems to be related to the
> tclib, when I use
> it as a clocksource. The numbers of overruns depends on the type of
> files too.
> It is possible?
>
> Regards
> Michael
>
>
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