From: Wolfgang Grandegger <wg@domain.hid>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] RT socket CAN architecture
Date: Wed, 18 Oct 2006 12:56:59 +0200 [thread overview]
Message-ID: <4536087B.7040301@domain.hid> (raw)
In-Reply-To: <45360543.7010503@domain.hid>
Jan Kiszka wrote:
> Frits de Klark wrote:
>> Hello everyone,
>>
>> I'm in the need of a realtime CAN driver which is as fast as possible
>> and at
>> the same time user-friendly. The RT socket CAN driver looks rather
>> appealing
>> to me, but I'm wondering if there's any negative impact on speed (in the
>> context of minimal response times) in using a socket approach.
>> Also, is there any of you with some testresults?
>
> Wolfgang once had some test results (and application code) on
> hardware-based loopback latencies, maybe he can post them when time permits.
A while ago I ported the round-trip-test from RTnet. "rtcan_rtt" is a
simplified version available in rtsocketcan-0.90.0.tar.bz2 at
ftp://ftp.denx.de/pub/xenomai/rtsocketcan.
> For sure, twiddling directly with the CAN hardware is always faster than
> having generic layer(s) in between, but the impact of the CAN stack is
> fairly small, specifically as we have a direct wake-up path from the IRQ
> to the application on reception or TX buffer availability.
>
> Do you have any scenario and/or numbers you would like to compare them
> against?
And what platform do you intend to use?
Wolfgang.
prev parent reply other threads:[~2006-10-18 10:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-18 9:47 [Xenomai-help] RT socket CAN architecture Frits de Klark
2006-10-18 10:43 ` Jan Kiszka
2006-10-18 10:56 ` Wolfgang Grandegger [this message]
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