From: user5857@newsgrouper.org.invalid   
      
   Stefan Monnier  posted:   
      
   > >> | - virtually tagged caches   
   > >> |   You can't really claim to be worst-of-the-worst without virtually   
   > >> |tagged caches.   
   > >> |  Tears of joy as you debug cache alias issues and of flushing caches   
   > >> |on context switches.   
   > > That is only true if one insists on OS with Multiple Address Spaces.   
   > > Virtually tagged caches are fine for Single Address Space (SAS) OS.   
   >   
   > AFAIK, the main problem with SASOS is "backward compatibility", most   
   > importantly with `fork`.  The Mill people proposed a possible solution,   
   > which seemed workable, but it's far from clear to me whether it would   
   > work well enough if you want to port, say, Debian to such   
   > an architecture.   
      
   SASOS seems like a bridge too far.   
   >   
   >   
   >         Stefan   
      
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