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.

Thanks,
Bert

On 6/23/05, Adam Lackorzynski <adam at os.inf.tu-dresden.de> wrote:
> 
> Hi,
> 
> 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 
> L4Linux
> > virtual console uses up CPU time? Is this "normal" behaviour? My DROPS
> > console shows +- 25% CPU usage if the DROPS virtual console is focused 
> on
> > 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 
> running
> > the L4Linux virtual console is at priority 0xff, but the main L4Linux 
> task
> > 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 adam at os.inf.tu-dresden.de
> Lackorzynski http://os.inf.tu-dresden.de/~adam/
> 
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-- 
BvL
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