From: Pete Zaitcev <zaitcev@redhat.com>
To: "René Rebe" <rene@exactcode.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: MAX_USBFS_BUFFER_SIZE
Date: Thu, 2 Mar 2006 13:05:19 -0800 [thread overview]
Message-ID: <20060302130519.588b18a2.zaitcev@redhat.com> (raw)
In-Reply-To: <mailman.1141249502.22706.linux-kernel2news@redhat.com>
On Wed, 1 Mar 2006 22:42:35 +0100, René Rebe <rene@exactcode.de> wrote:
> > > drivers/usb/core/devio.c:86
> > > #define MAX_USBFS_BUFFER_SIZE 16384
> So, queing alot URBs is the recommended way to sustain the bus? Allowing
> way bigger buffers will not be realistic?
Have you ever considered how many TDs have to be allocated to transfer
a data buffer this big? No, seriously. If your application cannot deliver
the tranfer speeds with 16KB URBs, we ought to consider if the combination
of our USB stack, usbfs, libusb and the application ought to get serious
performance enhancing surgery. The problem is obviously in the software
overhead.
-- Pete
next prev parent reply other threads:[~2006-03-02 21:05 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 ` 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 ` Pete Zaitcev [this message]
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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