L4Linux console using CPU
Bert van Leeuwen
bert.vanleeuwen at gmail.com
Thu Jun 23 23:03:00 CEST 2005
I'm using kernel 2.4, but I am using a framebuffer console, I will have a
look into it.
On 6/23/05, Adam Lackorzynski <adam at os.inf.tu-dresden.de> wrote:
> On Thu Jun 23, 2005 at 22:25:31 +0200, Bert van Leeuwen wrote:
> > Does anybody perhaps know why a DROPS virtual console focused on a
> > virtual console uses up CPU time? Is this "normal" behaviour? My DROPS
> > console shows +- 25% CPU usage if the DROPS virtual console is focused
> > the L4Linux terminal, +- 1% if the DROPS virtual console is focused on
> > something else (e.g. run console). From what I can tell, the thread
> > the L4Linux virtual console is at priority 0xff, but the main L4Linux
> > appears to be at default priority 0x10... Is this correct?
> If your L4Linx is 2.6 and you're using the l4fb driver, then the driver
> periodically refreshes the screen which costs CPU. You can switch that
> off by giving "l4fb.refreshsleep=0" at the kernel command line. But then
> user programs using the frame buffer (e.g. X) will not display anything.
> Maybe giving a bigger value will suit you better.
> Adam adam at os.inf.tu-dresden.de
> Lackorzynski http://os.inf.tu-dresden.de/~adam/
> l4-hackers mailing list
> l4-hackers at os.inf.tu-dresden.de
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