From: "René Rebe" <rene@exactcode.de>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org, Oliver Neukum <oliver@neukum.org>
Subject: Re: MAX_USBFS_BUFFER_SIZE
Date: Thu, 2 Mar 2006 17:03:26 +0100 [thread overview]
Message-ID: <200603021703.26549.rene@exactcode.de> (raw)
In-Reply-To: <20060301215423.GA17825@kroah.com>
Hi,
On Wednesday 01 March 2006 22:54, Greg KH wrote:
> > > 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) ...
>
> No, do it in your application I mean.
Ok, tweaking libusb to queue N URBs for reads to be split (resulting in 9 URBs
in my usecase) I see a nearly 100% improvement here (2 times faster).
How many URBs may I queue? Nearly infinite (in my case that would be max 64)
or is there some tiny static list somewhere in the affected code-path?
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:[~2006-03-02 16:03 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 ` René Rebe [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200603021703.26549.rene@exactcode.de \
--to=rene@exactcode.de \
--cc=greg@kroah.com \
--cc=linux-kernel@vger.kernel.org \
--cc=oliver@neukum.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox