Re: slow USB 3.0 on -current

From: Hans Petter Selasky <>
Date: Sun, 12 Jul 2020 09:57:10 +0200
On 2020-07-12 00:44, John-Mark Gurney wrote:
> Hello,
> I'm having issues getting good ethernet performance from a USB ethernet
> adapter (ure) under FreeBSD on an HP EliteDesk 705 G2 Mini[1].  It's an
> AMD PRO A10-8700B based system using the AMD A78 FCH chipset.
> Under FreeBSD -current (r362596), 12.1-R and 11.4-R, the RealTek USB
> adapter only gets around 10MB/sec performance.  During the transfer,
> the CPU usage is only around 3-5%, so it's definitely not CPU bound.
> I have tested Windows 10 and NetBSD 9.0 performance, and both provide
> 100MB/sec+ w/o troubles.
> I have attached dmesg from both FreeBSD -current and NetBSD 9.0.
> Any hints on how to fix this?
> This may be related, but I'm also having issues w/ booting when I have
> both a SD USB 2.0 card reader AND the ure plugged into USB 3.0 ports.
> If I move the SD card reader to USB 2.0, the umass device will attach
> and work.  I have also attached a clip of the dmesg from that
> happening.
> Has anyone else seen this issue?  Ideas or thoughts on how to resolve
> the performance issues?


Can you check the output from ifconfig. What is the actual link speed. I 
suspect it has something to do with the MII bus code/implementation.

Also check output from "vmstat -i" during usage to see if the number of 
IRQ/s is low.

Received on Sun Jul 12 2020 - 05:57:41 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:24 UTC