Preempt-RT support about meta-intel-edison

[htot]

I like it, but in case of troubles might be difficult to get support from kernel developers?
If found the bugs hurting us (eem ethernet over gadget) are the same for -rt and normal kernel. So the only real downside it reduced performance that you can notice as a reduced ethernet speed (iperf3).

BTW we have a Telegram group called Intel Edison https://t.me/IntelEdison

[mwallnoefer]

If found the bugs hurting us (eem ethernet over gadget) are the same for -rt and normal kernel. So the only real downside it reduced performance that you can notice as a reduced ethernet speed (iperf3).

Okay, maybe things get better in the future, when the whole rt patchset lands in the vanilla kernel.

[htot]

I would say reduced performance in some area's is to be expected, in particular like eem ethernet (gadget) as it involves dwc3 interrupts. The -rt patch converts interrupts to tasklets so they can be made interruptible by higher priority tasklets. This is the essence of the -rt patch, to reduced latencies at the expense of throughput.

With the -rt patch is see latencies 50 - 100 us, without -rt patch sometimes spikes to 100ms.

[htot]

With dunfell there is a -rt kernel provided.