Re: serial/ftdi_sio byte loss / performance regression

2013-06-12 Thread Johan Hovold
> > a37025b USB: ftdi_sio: fix chars_in_buffer overhead > > c413364 USB: ftdi_sio: clean up get_modem_status > > dcf0105 USB: serial: add generic wait_until_sent implementation > > > > These three are also needed in 3.9 (and also 3.8). > > I have these three. 3.8-stable is dead as far as I'm

Re: serial/ftdi_sio byte loss / performance regression

2013-06-11 Thread Greg KH
On Tue, Jun 11, 2013 at 12:43:25PM +0200, Johan Hovold wrote: > On Mon, Jun 10, 2013 at 02:39:06PM -0700, Greg KH wrote: > > On Thu, Jun 06, 2013 at 11:21:54AM -0700, Greg KH wrote: > > > On Thu, Jun 06, 2013 at 11:58:56AM +0200, Johan Hovold wrote: > > > > > Greg, perhaps we should consider backp

Re: serial/ftdi_sio byte loss / performance regression

2013-06-11 Thread Johan Hovold
On Mon, Jun 10, 2013 at 02:39:06PM -0700, Greg KH wrote: > On Thu, Jun 06, 2013 at 11:21:54AM -0700, Greg KH wrote: > > On Thu, Jun 06, 2013 at 11:58:56AM +0200, Johan Hovold wrote: > > > Greg, perhaps we should consider backporting the wait-until-sent > > > patches (i.e. 0693196fe..4746b6c6e)? >

Re: serial/ftdi_sio byte loss / performance regression

2013-06-10 Thread Greg KH
On Thu, Jun 06, 2013 at 11:21:54AM -0700, Greg KH wrote: > On Thu, Jun 06, 2013 at 11:58:56AM +0200, Johan Hovold wrote: > > On Thu, Jun 06, 2013 at 10:50:36AM +0200, Tomaž Šolc wrote: > > > Hi > > > > > > I have noticed that the ftdi_sio serial driver in recent kernel versions > > > has very bad

Re: serial/ftdi_sio byte loss / performance regression

2013-06-06 Thread Tomaž Šolc
On 06/06/2013 11:58 AM, Johan Hovold wrote: > On Thu, Jun 06, 2013 at 10:50:36AM +0200, Tomaž Šolc wrote: >> I have noticed that the ftdi_sio serial driver in recent kernel versions >> has very bad performance when used through the Python's serial library. >> >> As a test case I have a custom devic

Re: serial/ftdi_sio byte loss / performance regression

2013-06-06 Thread Greg KH
On Thu, Jun 06, 2013 at 11:58:56AM +0200, Johan Hovold wrote: > On Thu, Jun 06, 2013 at 10:50:36AM +0200, Tomaž Šolc wrote: > > Hi > > > > I have noticed that the ftdi_sio serial driver in recent kernel versions > > has very bad performance when used through the Python's serial library. > > > > A

Re: serial/ftdi_sio byte loss / performance regression

2013-06-06 Thread Johan Hovold
On Thu, Jun 06, 2013 at 10:50:36AM +0200, Tomaž Šolc wrote: > Hi > > I have noticed that the ftdi_sio serial driver in recent kernel versions > has very bad performance when used through the Python's serial library. > > As a test case I have a custom device that will send a continuous block > of

serial/ftdi_sio byte loss / performance regression

2013-06-06 Thread Tomaž Šolc
Hi I have noticed that the ftdi_sio serial driver in recent kernel versions has very bad performance when used through the Python's serial library. As a test case I have a custom device that will send a continuous block of 5k characters once every few seconds over a RS-232 line (115200 baud) to a