Bug 231065 - USB-Disk not at full speed
Summary: USB-Disk not at full speed
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: arm (show other bugs)
Version: 10.2-RELEASE
Hardware: arm Any
: --- Affects Some People
Assignee: freebsd-arm mailing list
Keywords: performance
Depends on:
Reported: 2018-08-31 19:57 UTC by lothar.linhard
Modified: 2018-08-31 20:23 UTC (History)
0 users

See Also:


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Description lothar.linhard 2018-08-31 19:57:44 UTC

Comment 1 lothar.linhard 2018-08-31 20:23:18 UTC
I compare the data transfer rate on FreeBSD 11.2 (same on 11.1) with Debian Stretch (Raspbian) on the same hardware: with "dd if=/dev/da0 of=/dev/null bs=32k"

On FreeBSD, I get approx 13MB/s
On Debian,  I get approx 37MB/s

My hardware is the Raspberry PI2 B (Cortex-A7) and a 2TB Intenso External USB Disk. Here is some information from /var/log/messages:

 kernel: ugen0.4: <Intenso External USB 3.0> at usbus0
 kernel: umass0
 kernel: on uhub1
 kernel: umass0: <Intenso External USB 3.0, class 0/0, rev 2.10/3.07, addr 4> on usbus0
 kernel: da0 at umass-sim0 bus 0 scbus0 target 0 lun 0
Aug 31 18:09:12 rpiBackup kernel: da0: <Intenso External USB 3.0 5438> Fixed Direct Access SPC-4 SCSI device
 kernel: da0: Serial Number 20161117015346
 kernel: da0: 40.000MB/s transfers
 kernel: da0: 1907729MB (3907029164 512 byte sectors)
 kernel: da0: quirks=0x2<NO_6_BYTE>