linux-kernel - Re: [RFC PATCH 3/4] tty: omap-serial: use threaded interrupt handler

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Message-ID: <20140821214840.GU11146@saruman.home>
Date:	Thu, 21 Aug 2014 16:48:40 -0500
From:	Felipe Balbi <balbi@...com>
To:	Frans Klaver <frans.klaver@...ns.com>
CC:	Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexey Pelykh <alexey.pelykh@...il.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Frans Klaver <fransklaver@...il.com>,
	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/4] tty: omap-serial: use threaded interrupt handler

Hi,

On Thu, Aug 21, 2014 at 11:41:17PM +0200, Frans Klaver wrote:
> On Wed, Aug 20, 2014 at 11:06:05AM -0500, Felipe Balbi wrote:
> > On Wed, Aug 20, 2014 at 08:40:28AM +0200, Frans Klaver wrote:
> > > On Tue, Aug 19, 2014 at 01:57:02PM -0500, Felipe Balbi wrote:
> > > > On Tue, Aug 19, 2014 at 02:14:47PM +0200, Frans Klaver wrote:
> > > > > At 3.6Mbaud, with slightly over 2Mbit/s data coming in, we see 1600 uart
> > > > > rx buffer overflows within 30 seconds. Threading the interrupt handling reduces
> > > > > this to about 170 overflows in 10 minutes.
> > > > 
> > > > Can you try Sebastian Siewior's patches for 8250_omap and 8250 dma
> > > > support ? That should help you a lot.
> > > 
> > > I'll have a look at that series. Thanks for pointing it out.
> 
> I have had a look at Sebastian's series, but I'm not convinced
> yet that we should use it. So far the serial console seems to be
> missing data every now and then. I haven't gotten around to testing our
> high traffic application yet.

as any new driver, there are bugs to be fixed. How about reporting the
ones you found together with a way of reproducing them so they can be
fixed ?

cheers

-- 
balbi

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