linux-kernel - Re: [Patch] Increase USBFS Bulk Transfer size

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Message-ID: <Pine.LNX.4.44L0.1110131606030.2026-100000@iolanthe.rowland.org>
Date:	Thu, 13 Oct 2011 16:07:51 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Markus Rechberger <mrechberger@...il.com>
cc:	Chris Friesen <chris.friesen@...band.com>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] Increase USBFS Bulk Transfer size

On Thu, 13 Oct 2011, Markus Rechberger wrote:

> fair enough I have 2 devices which don't work properly with bulk.
> Device A works by adjusting a hardware register
> Device B is documented in this thread.
> 
> Device A causes corruptions when the hardwareregister is set to a
> buffersize > 16k.
> There is certainly something on the physical usb layer which is unknown to the
> (software) USB experts here.
> The logfiles in the previous email shows up enough and is clear enough.

When you ran the test using the 12288/11776 sizes, did you change the 
hardware register buffersize value?  Or did you leave it set to the 
same 24064 as in the other test?

Alan Stern

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