On 7 Apr 2001, at 12:02, Greg Lehey wrote:

> They run multiple Linux tasks in parallel because, they say, Linux
> doesn't scale well.
Hi,

the S/390 will let you assign a specific CPU and/or IO performance 
to a linux partition. To have the same effect under Linux one needed 
realtime extensions. IIRC it is possible to run several OS/390 
instances side by side. The licensing sheme on the S/390 is often 
based upon CPU usage, that can be done more easy if you 
dedicate a given CPU performance to a linux partition. And then you 
may not forget that there will be security problems if there are more 
people having root access to one instance of Linux, on a higher end 
S/390 several hundred Linux partitions can be run each with the 
same or higher performance than a GHz. Intel CPU. 

mike