Re: slow USB 3.0 on -current

Kevin Oberman wrote this message on Sun, Jul 12, 2020 at 16:24 -0700:
> On Sun, Jul 12, 2020 at 2:55 PM John-Mark Gurney <jmg_at_funkthat.com> wrote:
> 
> > Hans Petter Selasky wrote this message on Sun, Jul 12, 2020 at 09:57 +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.
> >
> > ifconfig is reporting it's 1000baseT.
> >
> > > Also check output from "vmstat -i" during usage to see if the number of
> > > IRQ/s is low.
> >
> > Not sure what is considered low, but I'm seeing consistently around
> > 7800 int/s for xhci0.
> >
> This is just for clarification, but is 'MB' MBytes? In the networking world
> that is what it would mean, but the context leads me to think that you mean
> Mbits. It's also possible that some numbers are in bits and some in Bytes,
> causing real confusion. I'm sure that 1000baseT is bits, of course.

MB means megabytes.. I would use Mbps for bits...  so, on Win10 and
NetBSD, I'm able to get 100 MBytes/sec on Win10/NetBSD, and FreeBSD,
I'm only getting a tenth the capability of gige at 9-10 MBytes/sec...

I'll note that fetch reports numbers of MBps, which is one of the tools
I've been using for testing.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."