From: "René Rebe" <rene@exactcode.de>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: MAX_USBFS_BUFFER_SIZE
Date: Wed, 1 Mar 2006 22:42:35 +0100 [thread overview]
Message-ID: <200603012242.35633.rene@exactcode.de> (raw)
In-Reply-To: <20060301213223.GA17270@kroah.com>
Hi,
On Wednesday 01 March 2006 22:32, Greg KH wrote:
> On Wed, Mar 01, 2006 at 09:16:25PM +0100, Ren?? Rebe wrote:
> > Hi,
> >
> > I wonder if:
> >
> > drivers/usb/core/devio.c:86
> > #define MAX_USBFS_BUFFER_SIZE 16384
> >
> > is some random, or outdated limit or if there really is some code path that could
> > not handle bigger URBs.
> >
> > For performance reasons I would like to use bigger packages for an image
> > aquisition device.
>
> Why not just send down 2 urbs with that size then, that would keep the
> pipe quite full.
Because that requires even more modifications to libusb and sane (i_usb) ...
So, queing alot URBs is the recommended way to sustain the bus? Allowing
way bigger buffers will not be realistic?
Yours,
--
René Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany)
http://www.exactcode.de | http://www.t2-project.org
+49 (0)30 255 897 45
next prev parent reply other threads:[~2006-03-01 21:42 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 ` René Rebe [this message]
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 ` 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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