From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Corey Minyard <cminyard@mvista.com>
Cc: rolf.freitag@email.de, linux-rt-users@vger.kernel.org
Subject: Re: Why is real time pinging not possible with RT kernels?
Date: Tue, 13 Jun 2017 13:58:18 +0200 [thread overview]
Message-ID: <20170613115818.yjjoec3kojryuxam@linutronix.de> (raw)
In-Reply-To: <f60f3487-64d7-141c-6d6c-aec8318a87da@mvista.com>
On 2017-06-12 07:57:18 [-0500], Corey Minyard wrote:
> A few notes on what you have done:
>
> * ionice doesn't affect network I/O.
> * renice does not set real-time priorities.
> * You don't do anything with memory locking. What happens
> if memory in your program gets paged out then is required?
> * Something on the other end of the ping is running, too. It
> also needs to be real-time, too, and it's not by default.
You forgot to mention that the real-time kernel is not automatically
overclocking the software in terms of performance (but providing
determinism).
> I'd suggest you need to spend some time learning before you attempt
> something like this.
>
> -corey
Sebastian
next prev parent reply other threads:[~2017-06-13 11:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-10 18:13 Why is real time pinging not possible with RT kernels? rolf.freitag
2017-06-12 5:10 ` Chris Friesen
2017-06-12 12:57 ` Corey Minyard
2017-06-12 13:17 ` Peter C. Wallace
2017-06-12 16:45 ` Chris Friesen
2017-06-12 17:16 ` Corey Minyard
2017-06-17 8:37 ` rolf.freitag
2017-06-17 12:10 ` Corey Minyard
2017-06-13 11:58 ` Sebastian Andrzej Siewior [this message]
2017-06-13 16:06 ` Chris Friesen
2017-06-13 16:53 ` Corey Minyard
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