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From: Olivier Galibert <galibert@pobox.com>
To: Greg KH <greg@kroah.com>
Cc: Ren? Rebe <rene@exactcode.de>, linux-kernel@vger.kernel.org
Subject: Re: MAX_USBFS_BUFFER_SIZE
Date: Thu, 2 Mar 2006 00:25:35 +0100	[thread overview]
Message-ID: <20060301232535.GA13225@dspnet.fr.eu.org> (raw)
In-Reply-To: <20060301224123.GA10422@kroah.com>

On Wed, Mar 01, 2006 at 02:41:23PM -0800, Greg KH wrote:
> On Wed, Mar 01, 2006 at 11:34:30PM +0100, Olivier Galibert wrote:
> > As a data point, I have traces of a scanner session including a
> > download of a 26Mb binary image using 524288 bytes logical blocks
> > physically transferred with 61440 bytes bulk_in frames.  Seems stable
> > enough.  IIRC the scanner-side controller chip has some advanced
> > buffering just to handle that kind of bandwidth.
> 
> That's impressive.  What are the endpoint sizes on the device that did
> this?

Hmmm, the chip is a Genesys gl841, on a canonscan lide 35.  And it
advertises a 64 bytes wMaxPacketSize on both in and out bulk
interfaces.  Go figure.

Want the log and/or the lsusb -v?

  OG.

  reply	other threads:[~2006-03-01 23:25 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-01 20:16 MAX_USBFS_BUFFER_SIZE René Rebe
2006-03-01 20:53 ` MAX_USBFS_BUFFER_SIZE Oliver Neukum
2006-03-01 21:32 ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-01 21:42   ` MAX_USBFS_BUFFER_SIZE René Rebe
2006-03-01 21:54     ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-01 22:34       ` MAX_USBFS_BUFFER_SIZE Olivier Galibert
2006-03-01 22:41         ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-01 23:25           ` Olivier Galibert [this message]
2006-03-01 23:37             ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-02  9:04       ` MAX_USBFS_BUFFER_SIZE René Rebe
2006-03-02 16:47         ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-02 16:03       ` MAX_USBFS_BUFFER_SIZE René Rebe
2006-03-02 16:47         ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-01 21:59     ` MAX_USBFS_BUFFER_SIZE Duncan Sands
2006-03-03 10:34       ` MAX_USBFS_BUFFER_SIZE Oliver Neukum
     [not found]   ` <mailman.1141249502.22706.linux-kernel2news@redhat.com>
2006-03-02 21:05     ` MAX_USBFS_BUFFER_SIZE Pete Zaitcev
2006-03-03  7:27       ` MAX_USBFS_BUFFER_SIZE René Rebe
2006-03-03 20:32         ` MAX_USBFS_BUFFER_SIZE Greg KH
2006-03-03  8:12       ` MAX_USBFS_BUFFER_SIZE Duncan Sands
2006-03-03 10:29         ` MAX_USBFS_BUFFER_SIZE Oliver Neukum

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