slow USB 3.0 on -current
Hans Petter Selasky
hps at selasky.org
Sun Jul 12 07:57:41 UTC 2020
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?
Hi,
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.
--HPS
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