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Date: Fri, 7 Nov 2008 20:19:35 +0100
From: Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>
To: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-current@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: Kernel panic when copying data to umass device (USB4BSD) -
	problem found
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On Fri, Nov 07, 2008 at 06:11:26PM +0100, Hans Petter Selasky wrote:
> 
> Hi Jeremy,
> 
> I've reproduced the issue with some mods to the usb2_busdma.c on 32-bit 
> arcitecture and have made a fix for this problem.
> 
> Try the following patch and re-test!
>
Thanks a lot! I have rebuild the kernel with this patch
> 
> http://perforce.freebsd.org/chv.cgi?CH=152624
> 
and so far no panics. Indeed, the system I am using is amd64 with 4Gb of RAM.

> Some mem-stick benchmarks would be nice ...
> 
What exactly do you mean?
I have done:
dd if=file_on_one_stick of=/dev/null bs=1m (12.5 Mb/s)
dd if=/dev/random of=file_on_the_stick bs=1m count=128 (2.6 Mb/s)

and the same tests with USB-microSDHC adapter with 8Gb card
(20 MB/s read, 15 Mb/s write).

Anything else?

Alexey.