Re: UHCI/EHCI interrupt storm after resume from S3

2013-05-04 Thread Peter P Waskiewicz Jr
On 05/03/2013 08:27 AM, Alan Stern wrote: On Tue, 19 Mar 2013, Waskiewicz Jr, Peter P wrote: On 3/18/2013 1:35 PM, Greg KH wrote: On Mon, Mar 18, 2013 at 01:30:47PM -0700, Waskiewicz Jr, Peter P wrote: I have an Atom-based machine (N450) with an ICH8 running Ubuntu LTS 12.04.2. This has the

Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

2013-05-04 Thread Stas Sergeev
04.05.2013 00:34, Greg KH пишет: Don't call select for every character :) OK, let me draw an approximate workflow of the setup in question. Lets say we have 3 tty devices, A, B and C. A and B are blazingly fast, while C is a casual usb-serial chip. The app must establish a bidirectional relay be

Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

2013-05-04 Thread Johan Hovold
On Sat, May 04, 2013 at 01:50:42AM +0400, Stas Sergeev wrote: > 04.05.2013 00:34, Greg KH пишет: > > On Fri, May 03, 2013 at 10:27:18PM +0400, Stas Sergeev wrote: > >> 03.05.2013 21:16, Greg KH пишет: [...] > >>> There's no guarantee as to how long select or an ioctl will take, and > >>> now that

Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

2013-05-04 Thread Stas Sergeev
04.05.2013 15:15, Johan Hovold пишет: The query takes longer than the transmit at decent baudrates (>=38k) and under the assumption that flow control isn't causing any delays. But you do have a point, and I have been meaning to look into whether the added overhead of checking the hardware buffer

Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

2013-05-04 Thread Peter Hurley
On 05/04/2013 07:15 AM, Johan Hovold wrote: On Sat, May 04, 2013 at 01:50:42AM +0400, Stas Sergeev wrote: 04.05.2013 00:34, Greg KH пишет: On Fri, May 03, 2013 at 10:27:18PM +0400, Stas Sergeev wrote: 03.05.2013 21:16, Greg KH пишет: [...] There's no guarantee as to how long select or an i

Re: [PATCH 1/2] usb: gadget/uvc: remove connect/disconnect calls on open/release

2013-05-04 Thread Bhupesh SHARMA
Hi, On 5/3/2013 6:00 PM, Vladimir Zapolskiy wrote: Hi Laurent, thank you for the comment. On 05/03/13 02:05, Laurent Pinchart wrote: Hi Vladimir, On Friday 03 May 2013 02:00:29 Vladimir Zapolskiy wrote: On 05/03/13 01:18, Laurent Pinchart wrote: On Friday 03 May 2013 01:13:48 Vladimir Zapo

Re: [PATCH 1/2] usb: gadget/uvc: remove connect/disconnect calls on open/release

2013-05-04 Thread Bhupesh SHARMA
On 5/3/2013 2:07 PM, Michael Grzeschik wrote: Hi Laurent, On Fri, May 03, 2013 at 01:20:15AM +0200, Laurent Pinchart wrote: [snip] I'm open to suggestions :-) What features of the userspace application do you think could (and should) be moved to kernelspace ? Many of them are highly application