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I will install LinuxCNC onto a random (not-super-ancient) HDD.

I hope it goes well.

Weird.

FreeBSD seems faster.

Why would they switch to Debian?

landoneilers wrote:

Why TrueNAS over FreeBSD?

(I know TrueNAS is based on FreeBSD, but still)

It's not, new version is Debian as far as i can gather from the boot time info.

landoneilers wrote:

I have never seen a motherboard with more than 4 SATA ports.

I've always had with more than 4 as they also had a separate SATA controller with RAID, still have 2 with 6 SATA ports, and all Enterpise towers also have 6 or 8 ports (HP Z420 and Z600)

Yes I will, I did take some photos and know what's the system PLC/System they use, I'll have to come back I hope later today to upload some photos about it.

Does HDD cache size have any impact?

HDD read/write has no impact on latency.which measures hardware performance, network latency is important for mesa/ethercat systems.
The buffering of gcode will be sufficient to cover HDD speed.
Using a SSD is  a great boost in performance and I usually install one when refurbing a machine. Recently I didn't on a 8 core i7 & I really noticed how much longer Debian took to install. 

Use the one you say is ideal

Why TrueNAS over FreeBSD?

(I know TrueNAS is based on FreeBSD, but still)

I have never seen a motherboard with more than 4 SATA ports.

I don't really need NAS, though that is a cool idea, I suppose.

This is a snapshot of latency of that PC when I tested servomotors.

I'll try exact same former procedures ( I have written something important about disabling eoe, and recalling everything as much as possible ) with former PC today.

Thank you so much for your every skillful reply.
 

I tried to run through this and see what I could see, with your partial cut file being a mess, it's hard for me to guess at where you are trying to start and what is going on. Can you post the actual cut file?

Also, what version of QtPlasmaC are you running? need the entire number in the window header.

landoneilers wrote:

500GB WD Blue HDD (16MB cache) (The ideal choice, I have like 6 extra ones)

Get an old mainboard/CPU/MEM and plug all 6 to it, see bellow

landoneilers wrote:

256 SanDisk SSD (I only have 4).

Use for LinuxCNC machines, much better latency/access times compared to mechanical drives, and much faster.

landoneilers wrote:

500GB WD Blue HDD (32MB cache) (Less plentiful than the 16MB caache drives, but I don't really need this drive for anything).

Use this one to install TrueNAS and plug it into the same old PC mentioned above with the other 6 drives, you get a nice 2.5TB NAS with fault tolerance for one failed drive.

I do a lot, older versions (no idea what the number is), and i replied to the other post regarding Xenomai.
Thank you.
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In short, i do not necessarily need the latest version, either of RTAI or LinuxCNC, i stick to what reliably works.

I am planning to install LinuxCNC 2.9.8 for a parallel port setup (I know Wheezy is probably better, but I need it to be as user-friendly and modern as possible).

I have a bunch of disks I can install it to:

500GB WD Blue HDD (16MB cache) (The ideal choice, I have like 6 extra ones)
256 SanDisk SSD (I only have 4).
500GB WD Blue HDD (32MB cache) (Less plentiful than the 16MB caache drives, but I don't really need this drive for anything).

Which drive would be the best choice for latency.

Bootup time is irrelevant to me, latency is really my only concern.

I will use this PC almost exclusively for machine control, except to download nc files perhaps.

FYI, Mesa Ethernet does not work with RTAI kernel, so either way you look at it, RTAI was/is for software stepping mostly.
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Edit:
Personally i have in use a lot of parallel port machines, mostly with Ubuntu 10.04 still, and some new ones with Mint 19.2 and RTAI kernel, but i have much more with Mesa boards, and still i would say not to bother much with it as most of those machines with parallel port do not need the latest and greatest, the ISO for Ubuntu 6.04, 8.04, 10.04, and Wheezy are still available for download and all come with older versions of RTAI kernels.