Re: jitter bursts
From: Sven-Thorsten Dietrich <hidden>
Date: 2007-09-02 04:12:38
On Fri, 2007-08-31 at 17:17 +0200, Robert Schwebel wrote:
Hi,
We are currently porting a userspace realtime network stack (Ethernet
Powerlink -> EPL) to RT-Preempt, in order to play with the system and
find out what is possible today with a standard linux-rt and userspace
socket based stacks.
We currently see a strange latency effect. The scenario is like this:
+--------+ +-----------+ +-----------+
| PC EPL | | Second PC | | EPL Clamp |
+--------+ +-----------+ +-----------+
| | |
\ +----------+ /
\----| Hub |------/
+----------+Can you eliminate the hub as a variable? I have seen very similar experiments with multicast packets where the hub delivered packets out of order, or in a delayed fashion on one port, but not on the other. Sven