Re: [uml-devel] Problem with Real-Time Scheduling

[Jeff Dike <jdike@addtoit.com>]

ralston@stral.net said:
> I've come across a problem with running a user-mode-linux instance
> with RR-Scheduling. When I attempt to start a server with chrt the
> host system panics. I can start a uml in normal (other) scheduling,
> and then change it to RR-Scheduling and it works fine, until I try to
> stop the uml... then I get the same kernel panic.

Any time the host panics, it's time to send the details to LKML.

> how would different scheduling the different 'threads' of the UML
> effect performance? As far as I know.. the first 'linux' process
> actually does all the work and the extra processes are for the
> different IO the UML does, eg network, block devices etc? Would
> increasing the priority of the IO over the priority of the main
> process have an effect on network performance for example?

In skas mode, the first process runs the kernel, the second runs processes, 
and the other two handle SIGIO emulation and SIGWINCHes.  So, those two don't
matter, and first two are never running at the same time, so their relative
priorities don't matter.

				Jeff



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