mSATA SSD over USB adater: 300MB/s @ Linux versus 100MB/s @ FreeBSD

[vermaden]

Hi.

After this tweet:
https://twitter.com/ed_maste/status/1323635634221756416

Ed Maste suggested that I should post here some details about it. This is what I am doing right now.

The case is/was:

Dell XPS 12 with Intel i5-3317U CPU from 2012 and internal mSATA SSD (typical 500MB/s read/write SSD).

This one to be precise:
https://arstechnica.com/gadgets/2012/12/review-dells-acrobatic-xps-12-is-the-windows-8-convertible-to-beat/

Then with this USB<>mSATA adapter (probably some noname from China:
https://allegro.pl/oferta/pendrive-ssd-mini-pci-e-msata-do-usb-3-0-6016971433

I attached another mSATA SSD (typical 500MB/s read/write SSD) to the one of the USB 3.0 ports.

Then I executed this command:

// FROM INTERNAL TO EXTERNAL @ Linux
# dd < /dev/sda > /deb/sdb bs=8M status=progress

// FROM INTERNAL TO EXTERNAL @ FreeBSD
# dd < /dev/ada0 > /deb/da0 bs=8m status=progress

Average speed of that operation was:

Linux: 300MB/s

FreeBSD: 100MB/s

Here are the detailed logs of dmesg/pciconf/usbconfig commands:
http://athena.zia.io/~vermaden/dell.xps.12.logs.tar.gz

For this operation I booted from the FreeBSD 12.2-RELEASE 'memstick' image on USB pendrive.

Not sure how else I can help.

Regards,
vermaden