Re: [Ftdi-usb-sio-devel] High CPU usage

[Bill R. <bil...@gm...>]

The other questions is

What is using 100% CPU?

top should give you a hint.

 If it's your program you'll know where to look.



On Wed, Mar 11, 2009 at 6:13 AM, Toan Pham <tph...@gm...> wrote:

> you shouldn't get that high CPU utilization.  Would you please compile
> the kernel with usb debug, and ftdi_sio loaded with debug=1.
> I also use the same chip on linux 2.6.21 and tried on the lastest
> Ubuntu and had no problem.  Although, i didn't run it at 230400, and
> flow control enabled. If possible, would you please try to run it at
> lower baudrate and/or without software flow control?
> .  thank you.
>
> Toan
>
>
> On Tue, Mar 10, 2009 at 11:41 AM, iMac 266 <im...@gm...> wrote:
> > Hi,
> >
> > I am using a FT232RL USB to Serial adapter.  Baudrate = 230400, one stop
> and
> > start bit, software flow control enabled.
> >
> > I am using this on the 2.6.27 kernel.
> >
> > I am wondering why my cpu is at 100% when I am transmitting data
> > continuously.  When I use the same adapter and python code on a windows
> > machine I get 3% cpu usage. Is this a known issue?
> >
> > Thanks,
> >
> > Tim
> >
> >
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