Re: a joint letter on low latency and Linux

[Andi Kleen]

On Fri, Jun 30, 2000 at 07:16:13PM +0200, Roman Zippel wrote:
> Hi,
> 
> > > 	- Use Linus' trick of a multi threaded UP kernel using
> > > 	  SMP locks (2.5 material), also hated by Larry/Victor.
> > 
> > I don't hate it at all. I think it will add serious overhead, but
> > it is a clean design that can be turned off.
> 
> It will have about the same overhead as running a RTLinux kernel only that
> better latency is also available to user space.

Nope, you need a lot more locks in kernel structures (all spin_lock which
are noop ATM on UP will cost you) 

-Andi