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Date:      Thu, 05 Nov 2020 09:49:26 +0000
From:      esexirbar715@gmail.com
To:        freebsd-usb@freebsd.org
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Date: Thu, 05 Nov 2020 14:05:04 +0100
From: vermaden <vermaden@interia.pl>
Subject: Re: mSATA SSD over USB adater: 300MB/s @ Linux versus 100MB/s @
 FreeBSD
To: gljennjohn@gmail.com
Cc: freebsd-usb@freebsd.org
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So we should slow down Linux so FreeBSD can keep up? :)


Od: "Gary Jennejohn" <gljennjohn@gmail.com>
Do: "vermaden" <vermaden@interia.pl>;=20
Wys=C5=82ane: 10:27 Czwartek 2020-11-05
Temat: Re: mSATA SSD over USB adater: 300MB/s @ Linux versus 100MB/s @ Free=
BSD

> On Thu, 05 Nov 2020 10:13:51 +0100
> vermaden  wrote:
>=20
> > Hi.
> >=20
> > After this tweet:
> > https://twitter.com/ed_maste/status/1323635634221756416
> >=20
> > Ed Maste suggested that I should post here some details about it. This =
is what I am doing right now.
> >=20
> > The case is/was:
> >=20
> > Dell XPS 12 with Intel i5-3317U CPU from 2012 and internal mSATA SSD (t=
ypical 500MB/s read/write SSD).
> >=20
> > This one to be precise:
> > https://arstechnica.com/gadgets/2012/12/review-dells-acrobatic-xps-12-i=
s-the-windows-8-convertible-to-beat/
> >=20
> > Then with this USB<>mSATA adapter (probably some noname from China:
> > https://allegro.pl/oferta/pendrive-ssd-mini-pci-e-msata-do-usb-3-0-6016=
971433
> >=20
> > I attached another mSATA SSD (typical 500MB/s read/write SSD) to the on=
e of the USB 3.0 ports.
> >=20
> > Then I executed this command:
> >=20
> > // FROM INTERNAL TO EXTERNAL @ Linux
> > # dd < /dev/sda > /deb/sdb bs=3D8M status=3Dprogress
> >=20
> > // FROM INTERNAL TO EXTERNAL @ FreeBSD
> > # dd < /dev/ada0 > /deb/da0 bs=3D8m status=3Dprogress
> >=20
> > Average speed of that operation was:
> >=20
> > Linux: 300MB/s
> >=20
> > FreeBSD: 100MB/s
> >=20
> > Here are the detailed logs of dmesg/pciconf/usbconfig commands:
> > http://athena.zia.io/~vermaden/dell.xps.12.logs.tar.gz
> >=20
> > For this operation I booted from the FreeBSD 12.2-RELEASE 'memstick' im=
age on USB pendrive.
> >=20
> > Not sure how else I can help.
> >=20
>=20
> FreeBSD does transfers with a maximum size of 128kB.  Try repeating both =
tests
> with bs=3D128k to have a level playing field.
>=20
> --=20
> Gary Jennejohn
>=20





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