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From: Greg KH <greg@kroah.com>
To: Olivier Galibert <galibert@pobox.com>,
	Ren? Rebe <rene@exactcode.de>,
	linux-kernel@vger.kernel.org
Subject: Re: MAX_USBFS_BUFFER_SIZE
Date: Wed, 1 Mar 2006 14:41:23 -0800	[thread overview]
Message-ID: <20060301224123.GA10422@kroah.com> (raw)
In-Reply-To: <20060301223430.GA9159@dspnet.fr.eu.org>

On Wed, Mar 01, 2006 at 11:34:30PM +0100, Olivier Galibert wrote:
> On Wed, Mar 01, 2006 at 01:54:23PM -0800, Greg KH wrote:
> > On Wed, Mar 01, 2006 at 10:42:35PM +0100, Ren? Rebe wrote:
> > > So, queing alot URBs is the recommended way to sustain the bus? Allowing
> > > way bigger buffers will not be realistic?
> > 
> > 16Kb is "way big" in the USB scheme of things aready.  Look at the size
> > of your endpoint.  It's probably _very_ small compared to that.  So no,
> > larger buffer sizes is not realistic at all.
> 
> 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?

thanks,

greg k-h

  reply	other threads:[~2006-03-01 22:45 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         ` Greg KH [this message]
2006-03-01 23:25           ` MAX_USBFS_BUFFER_SIZE Olivier Galibert
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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