From owner-freebsd-net  Thu Jan  3 12:43:45 2002
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Date: Thu, 3 Jan 2002 15:43:29 -0500 (EST)
From: Mike Silbersack <silby@silby.com>
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To: Thomas Zenker <thz@Lennartz-electronic.de>
Cc: <net@freebsd.org>, Josef Karthauser <joe@tao.org.uk>,
	Matthew Dillon <dillon@apollo.backplane.com>
Subject: Re: USB ethernet problem
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On Wed, 2 Jan 2002, Thomas Zenker wrote:

> Hi Mike,
>
> back from holidays...
>
> because this is now discussed in different threads, on -stable and
> on -net, I will try to recapitulate what has happened and keep this
> on -net "USB ethernet problem".
>
> The performance problems apeared after updating my test system from
> 4.3 to 4.4 with Netgear EA101 USB/ethernet adaptor (kue driver).
> Performance dropped by a factor of 10 or more. The server in all
> cases was 4.4. After testing different slowstart flightsizes and
> send/recv buffer sizes with ttcp the findings were, that mostly the
> recvspace reduced to 16K (as in 4.3) recovered the performance. See
> also my message to -stable from 2001/12/14. The usb host controller
> on this system is a VIA 83C572 (UHCI).
>
> Now going to the final embedded hardware, the suprise was a hanging
> usb driver. The strange thing is, this does not happen while testing
> with ttcp, but only if the data is written to disk. The following
> kernel messages are printed:
>
> usb0: host controller process error
> usb0: host controller halted
> kue0: watchdog timeout
> kue0: usb error on tx: TIMEOUT
>
> this comes from uhci_intr() in dev/usb/uhci.c. Aparently the
> usb0-messages reflect a hw status register!? This happens very
> quickly with 4.4 (it is impossible to install over usb/ethernet),
> but I have seen it today for the first time with 4.3 also. The usb
> host controller is UHCI Intel 82371AB/EB (PIIX4).

Well, since you've been able to isolate this as the cause, there's no need
to run any more tcp tests with varying servers.  Try changing hz, as I
mentioned in the e-mail I just sent to you guys.  Also, try running ttcp
while seperately creating disk load (through a disk benchmark or
something.)  Meanwhile, watch systat -vm and see if the interrupt counts
show you anything interesting.

Thanks,

Mike "Silby" Silbersack


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