From: Wolfgang Grandegger <wg@grandegger.com>
To: Martin Kozusky <mkozusky@kkmicro.cz>
Cc: linux-can@vger.kernel.org
Subject: Re: CAN messages being lost on i.MX25 with flexcan
Date: Fri, 20 Apr 2012 09:59:29 +0200 [thread overview]
Message-ID: <4F911761.6040807@grandegger.com> (raw)
In-Reply-To: <jmqv1m$38p$1@dough.gmane.org>
On 04/20/2012 08:17 AM, Martin Kozusky wrote:
> Dne 20.4.2012 8:04, Wolfgang Grandegger napsal(a):
...
>> You are obviously hitting the resource limits. Do you need -rt? It makes
>> your system slower.
>
> I don't know what steps are necessary to make the kernel (and can
> driver) -rt :( I will first try to finish my app and see how it behaves.
Forget my comment. I was thinking that you are already using a -rt
kernel (with the real-time preemption patch), but that's obviously not
the case. Sorry for the noise.
...
>> Good. What does the CAN statistics show ($ ip -d -s link show can0)?
>
> Now it shows (after some time of experimenting, it was disconnected from
> canbus for a while)
>
> 2: can0: <NOARP,ECHO> mtu 16 qdisc pfifo_fast state DOWN mode DEFAULT
> qlen 10
> link/can
> can state STOPPED (berr-counter tx 0 rx 0) restart-ms 0
> bitrate 250000 sample-point 0.857
> tq 285 prop-seg 5 phase-seg1 6 phase-seg2 2 sjw 1
> flexcan: tseg1 4..16 tseg2 2..8 sjw 1..4 brp 1..256 brp-inc 1
> clock 66500000
> re-started bus-errors arbit-lost error-warn error-pass bus-off
> 0 0 0 1 0 0
> RX: bytes packets errors dropped overrun mcast
> 4758311 602831 212 0 212 0
There have been some RX FIFO overflow errors, which means messages are
lost by the hardware.
Wolfgang.
next prev parent reply other threads:[~2012-04-20 7:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 10:04 CAN messages being lost on i.MX25 with flexcan Martin Kozusky
2012-04-19 10:54 ` Wolfgang Grandegger
2012-04-19 11:21 ` Martin Kozusky
2012-04-19 11:44 ` Wolfgang Grandegger
2012-04-19 11:58 ` Martin Kozusky
2012-04-19 13:37 ` Wolfgang Grandegger
2012-04-20 5:51 ` Martin Kozusky
2012-04-20 6:04 ` Wolfgang Grandegger
2012-04-20 6:17 ` Martin Kozusky
2012-04-20 7:59 ` Wolfgang Grandegger [this message]
2012-04-19 20:00 ` Jesper Pedersen
2012-04-19 20:17 ` Wolfgang Grandegger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F911761.6040807@grandegger.com \
--to=wg@grandegger.com \
--cc=linux-can@vger.kernel.org \
--cc=mkozusky@kkmicro.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.