From: oliver@neukum.org (Oliver Neukum)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 1/4] USB: HCD: support giveback of URB in tasklet context
Date: Mon, 10 Jun 2013 11:31:15 +0200 [thread overview]
Message-ID: <10081846.6daPCXpZuS@linux-5eaq.site> (raw)
In-Reply-To: <CACVXFVPs-MJy595OyqMs9rNmNAqcU7JDHXp+yp5bnEdq7_M-fg@mail.gmail.com>
On Monday 10 June 2013 17:23:46 Ming Lei wrote:
> On Mon, Jun 10, 2013 at 4:43 PM, Oliver Neukum <oliver@neukum.org> wrote:
> > On Sunday 09 June 2013 23:18:28 Ming Lei wrote:
> >> 2), the biggest change is the situation in which usb_submit_urb() is called
> >> in complete() callback, so the introduced tasklet schedule delay might be a
> >> con, but it shouldn't be a big deal:
> >>
> >> - control/bulk asynchronous transfer isn't sensitive to schedule
> >> delay
> >
> > That is debatable.Missing a frame boundary is expensive because the increased
> > latency then translates into lower throughput.
>
> Suppose so, considered that bulk transfer will do large data block transfer, and
> the extra frame or uFrame doesn't matter over the whole transfer time.
That is not true for all use cases. Networking looks vulnerable.
Regards
Oliver
next prev parent reply other threads:[~2013-06-10 9:31 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-09 15:18 [RFC PATCH 0/4] USB: HCD/EHCI: giveback of URB in tasklet context Ming Lei
2013-06-09 15:18 ` [RFC PATCH 1/4] USB: HCD: support " Ming Lei
2013-06-09 15:58 ` Alan Stern
2013-06-10 8:12 ` Ming Lei
2013-06-10 8:43 ` Oliver Neukum
2013-06-10 9:23 ` Ming Lei
2013-06-10 9:31 ` Oliver Neukum [this message]
2013-06-10 9:51 ` Ming Lei
2013-06-09 15:18 ` [RFC PATCH 2/4] USB: EHCI: don't release ehci->lock if URB giveback " Ming Lei
2013-06-09 16:06 ` Alan Stern
2013-06-10 9:10 ` Ming Lei
2013-06-09 15:18 ` [RFC PATCH 3/4] USB: EHCI: improve interrupt qh unlink Ming Lei
2013-06-09 15:18 ` [RFC PATCH 4/4] USB: EHCI: support running URB giveback in tasklet context Ming Lei
2013-06-09 15:48 ` [RFC PATCH 0/4] USB: HCD/EHCI: giveback of URB " Alan Stern
2013-06-10 6:05 ` Ming Lei
2013-06-10 14:03 ` Alan Stern
2013-06-10 14:12 ` Oliver Neukum
2013-06-10 15:33 ` Alan Stern
2013-06-10 15:37 ` Ming Lei
2013-06-10 17:36 ` Alan Stern
2013-06-10 18:52 ` Steven Rostedt
2013-06-10 20:47 ` Alan Stern
2013-06-10 20:54 ` Steven Rostedt
2013-06-11 8:40 ` Ming Lei
2013-06-10 20:51 ` Alan Stern
2013-06-11 6:19 ` Ming Lei
2013-06-11 5:40 ` Ming Lei
2013-06-11 7:18 ` Oliver Neukum
2013-06-11 8:14 ` Ming Lei
2013-06-11 8:49 ` Oliver Neukum
2013-06-11 9:27 ` Ming Lei
2013-06-11 10:51 ` Oliver Neukum
2013-06-11 11:19 ` Ming Lei
2013-06-11 19:10 ` Alan Stern
2013-06-12 2:43 ` Ming Lei
2013-06-12 6:41 ` Ming Lei
2013-06-12 7:45 ` Thomas Gleixner
2013-06-13 2:25 ` Ming Lei
2013-06-13 14:54 ` Alan Stern
2013-06-13 18:47 ` Greg Kroah-Hartman
2013-06-13 19:41 ` Alan Stern
2013-06-13 20:08 ` Steven Rostedt
2013-06-13 21:09 ` Alan Stern
2013-06-13 22:24 ` Steven Rostedt
2013-06-13 23:08 ` Alan Stern
2013-06-14 1:27 ` Ming Lei
2013-06-14 0:35 ` Greg Kroah-Hartman
2013-06-14 1:53 ` Ming Lei
2013-06-14 6:05 ` Greg Kroah-Hartman
2013-06-14 10:05 ` Ming Lei
2013-06-14 1:37 ` Ming Lei
2013-06-14 3:24 ` Ming Lei
2013-06-14 14:56 ` Alan Stern
2013-06-14 15:15 ` Ming Lei
2013-06-14 20:23 ` Alan Stern
2013-06-14 21:09 ` Thomas Gleixner
2013-06-15 1:49 ` Ming Lei
2013-06-14 2:03 ` Ming Lei
2013-06-12 14:35 ` Alan Stern
2013-06-12 15:10 ` Oliver Neukum
2013-06-13 3:41 ` Ming Lei
2013-06-13 15:05 ` Alan Stern
2013-06-12 9:11 ` Oliver Neukum
2013-06-12 10:11 ` Ming Lei
2013-06-12 10:19 ` Oliver Neukum
2013-06-12 11:33 ` Ming Lei
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