From: Grygorii Strashko <grygorii.strashko@ti.com>
To: Julio Cruz Barroso <julio.cruz@smartmatic.com>,
Daniel Bristot de Oliveira <daniel@bristot.me>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Re: cyclictest versus custom SPI based system
Date: Fri, 15 Jan 2016 13:31:43 +0200 [thread overview]
Message-ID: <5698D89F.9020203@ti.com> (raw)
In-Reply-To: <AF04265A3FC2B144B9892F621A394E13D5C0C98E@tethys>
Hi Julio,
On 01/14/2016 10:11 AM, Julio Cruz Barroso wrote:
>
> I changed the policy:priority as you suggested and the system is stable now!! I will prepare
an application to measure the latency with some loads during long periods (but this is another thing).
>
> For reference, in my case (iMX6), the priority adjustment was done at spi.c (master->rt). A patch
was suggested to implement this by device tree but other opinion said that this sound like a Linux
specific feature/implementation [4]. Anyways, this is another issue.
>
Just curios, is it possible for you to achieve the same results from User space using chrt/taskset utils?
(without Kernel modification).
For example, I can see below processes on my system:
184 root 0 SW [spi32766]
and our QSPI driver don't use IRQs.
> [4] Patch to implement SPI RT in device tree: http://www.spinics.net/lists/arm-kernel/msg348713.html
>
--
regards,
-grygorii
next prev parent reply other threads:[~2016-01-15 11:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-13 17:06 cyclictest versus custom SPI based system Julio Cruz Barroso
2016-01-13 18:36 ` Daniel Bristot de Oliveira
2016-01-14 8:11 ` Julio Cruz Barroso
2016-01-15 11:31 ` Grygorii Strashko [this message]
2016-01-15 11:45 ` Julio Cruz Barroso
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