matthew green wrote:
   >    
   >    Just out of interest, is there a performance penalty on NetBSD when 
   >    executing 32-bit binaries with 64-bit kernel, as opposed to native 
   >    64-bit binaries? What about Solaris, does it use the same principles 
   >    when executing 32-bit binaries?
   > 
   > 
   > every application is different.  if you care about performance you
   > need to actually measure 32 vs 64 bit.  depending on the application
   > either one can be a clear winner, or perhaps it makes no difference.
   > 
   
   Sure, but I was thinking if you're running 64-bit kernel and execute 
   32-bit binary, does the OS need to use various emulation layers which 
   affect the performance?


there is a layer to convert 32 bit / 64 bit syscall arguments as required
but in my testing i can't notice it affecting performance.
   

.mrg.