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From: "J. Marincic" <j.marincic@imotec.nl>
To: linux-serial@vger.kernel.org
Subject: Serial communication under real-time Timesys Linux
Date: Thu, 20 Jan 2005 10:57:46 +0100	[thread overview]
Message-ID: <41EF809A.3060904@imotec.nl> (raw)


We are running hard RT and soft RT process under realtime OS Timesys 
Linux on the industrial PC. Hard RT process has a 1 milisecond period 
and soft RT runs with 300 milisecond period.

The Soft RT process is accessing the serial RS422 port and the driver 
used is the Linux serial driver. (We have an RS422 card and the driver 
is slightly modified by the manufacturer, but it is based on the Linux 
driver).

The serial communication affects hard RT process performance which 
results in its overruns. We suspect that the problem is in the serial 
communication driver - either the interrupt routine is not preemptible 
or the problem is that it uses jiffies or something else.

Does anyone know if there is a real-time serial driver available? Did 
anyone have experience with Timesys Linux?

Thanks in advance.


             reply	other threads:[~2005-01-20  9:55 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-20  9:57 J. Marincic [this message]
  -- strict thread matches above, loose matches on Subject: below --
2005-01-20 10:09 Serial communication under real-time Timesys Linux mrc

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