Re: CVS commit: src/sys/dev/usb

[Rin Okuyama <rokuyama%rk.phys.keio.ac.jp@localhost>]

On 2019/01/30 21:26, Michael van Elst wrote:
> On Wed, Jan 30, 2019 at 08:05:56PM +0900, Rin Okuyama wrote:
> > I tested a StarTech USB21000S2 adapter. It works both on RPI3B and
> > amd64 box with ehci(4) (ThinkPad X60). Revision is same as Z-TEK
> > ZE582; both have product ID of 0x7500 (LAN7500).
> >
> > There may be problem with the host controller?
>
> pinebook uses ehci too.

Hmm, puzzling...

> Do multiple outstanding requests show an advantage on your LAN7500
> devices?

Yes. There is significant improvement in receiving performance.

I tested it by using iperf3 with

Client:	RPI3B+ NetBSD/aarch64-current running at 1400MHz
	internal LAN7800 with all offloading enabled (enabled=7ff80)

Server: RPI3B+ NetBSD/aarch64-current running at 1400MHz
	LAN7500 with all offloading enabled (enabled=7ff80)

With multiple outstanding requests (for server), about 265Mbps for
receiving. Without multiple requests (for server), about 135Mbps.

For sending (-R), both about 265Mbps at best.

By the way, I find that the system hangs silently by
"ifconfig mueN down" or detaching LAN7500 from USB port when
multiple outstanding requests are enabled. This does not occur
when MUE_TX_LIST_CNT = MUE_RX_LIST_CNT = 1. Do you have any ideas
to fix it?

Thanks,
rin