Search found 6 matches

by TomT
Fri Feb 07, 2020 12:22 am
Forum: fitlet2 hardware
Topic: Wifi power management under Linux
Replies: 0
Views: 15873

Wifi power management under Linux

I found all sorts of strange latency over wifi with Intel 8260 or 9260 cards, like up to 100msec (!) for incoming pings. Turns out the iwlwifi Linux driver enables power management by default. Completely unnecessary in a line-powered device, for my application. Intel has a nice cheatsheet on fixing ...
by TomT
Fri Feb 07, 2020 12:14 am
Forum: fitlet2 hardware
Topic: Fitlet processor
Replies: 5
Views: 4568

Re: Fitlet processor

I see the Fitlet has 3 processor options - I wanted to know generally how they compare. Atom x7-E3950 [CE3950] Celeron J3455 [CJ3455] Atom x5-E3930 [CE3930] In my opinion, the Atoms are a good choice if you need graphics, and the Celeron is best for other purposes. The higher-spec Atom is kind of t...
by TomT
Thu Feb 06, 2020 11:59 pm
Forum: Cool stuff with fitlet2
Topic: Fitlet2 disk and network LED activity
Replies: 4
Views: 8497

Re: Fitlet2 disk and network LED activity

I edited the original post with tweaked code in the sleep loop to use bash builtins. It should run with a bit less overhead, and won't fork any short-term processes.
by TomT
Wed Feb 05, 2020 5:34 pm
Forum: Cool stuff with fitlet2
Topic: Fitlet2 disk and network LED activity
Replies: 4
Views: 8497

Re: Fitlet2 disk and network LED activity

Actually, there is a slight bug in my "sleep" approach, it makes bash into a cpu hog by reading /dev/zero. Oops. I fixed it by simply calling sleep, but plan to find a better fix, using only bash builtins again. Fixed inline above.

Anyway, glad it helps!
by TomT
Wed Feb 05, 2020 4:02 pm
Forum: Cool stuff with fitlet2
Topic: Fitlet2 disk and network LED activity
Replies: 4
Views: 8497

Fitlet2 disk and network LED activity

I cooked up this simple bash shell script to flash the fitlet2 LEDs for network and disk activity under Linux. It's implemented entirely with bash builtins and runs as a background daemon. It flashes the left LED "green" for disk activity, and the right LED "yellow" for network activity. It updates ...
by TomT
Wed Feb 05, 2020 2:32 pm
Forum: fitlet2 hardware
Topic: M.2 wifi compatibility
Replies: 5
Views: 4657

Re: M.2 wifi compatibility

The cause of this issue is the ability to choose the right PCI interface speed (Gen1/2). A fix for this issue is to disable the PCI De-emphasis option in the BIOS and set speed to Gen2. 1. De-emphasis disabled. 2. Speed – AUTO (to allow Gen2 speed). For my CJ3455 with an FC-CEM and Intel 9260, this...

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