On Wed, 24 Apr 2019, Mark wrote:
Date: Wed, 24 Apr 2019 06:31:00 -0400 From: Mark <[email protected]> Reply-To: "Enhanced Machine Controller (EMC)" <[email protected]> To: [email protected] Subject: Re: [Emc-users] possibly good news for LinuxCNCOn 4/24/19 06:26, andy pugh wrote:On Wed, 24 Apr 2019 at 11:09, Mark <[email protected]> wrote:Does preempt-rt not play well with parport configurations? Not having used a preempt-rt installation before, just curious.It can work fine. In fact my current dev PC shows better preempt-rt latency than I have eve seen with RTAI.But that is an outlier and typically RTAI latency is better than preempt-rt.Okay, so latency is the biggest concern with preempt-rt then. Mark
Yes, in my experience RTAI has better latency numbers especially on slower hardware. On fast hardware Preempt-RT and RTAI can have similar latency.
So for example most of the low power fanless PCs have rather dreadful latency on Preempt-RT though I3s.. I7s may be fine. It also difficult to compare newer CPUs since the RTAI kernsls are old enough that they dont support a lot of newer hardware.
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