🚀 go-pugleaf

Marcus J Ranum (mjr@TIS.COM) wrote:
> >The paper ignores the issue of cost, power consumption, and weight.
> >Cellular phones are going digital.  These require real time speech
> >compression algorithms in a unit small enough to be hand-held and
> >run for hours on battery power.
> 
> 	I have this great mental image of a cellular phone with the
> blades of an Alpha chip-radiator sticking out from the back...  The
> battery pack'd be a bitch to lug around with you - I guess you could
> use a little hand-truck or something.
> 
> mjr.

    I read that report and thought it was totally biased towards 
  general purpose cpu.  Look at the performace comparsion (2.2),
  it compared them with the cycle period at first.  Well, 21064 
  is well known as the fastest chip in the world, and TI320c40 
  costs as low as $500(? rumor.)  And the comparsion followed
  all assume the data and code is in cache (I guess? can someone
  prove this?)  Sure code can be in instruction cache, but data
  are changing with time, how can them exist in memory?

    Cannot deny that general purpose cpu has a better development
  environment.  But who said the DSP chips has no good development
  environment?  

    And the "Is Real Time Necessary" part made me feel strange.  
  Hum, real-time not necessary in DSP?  It said the general purpose
  cpu has cache, so after a initial time, it will run faster.  But
  the question is, the 8K cache on 21064 is enough?  

    I can imagine if a modem with 21064's heat-sinker.  (grin).

    21064 is a good general purpose cpu, but today's DSP is somewhat
  toward parallel processing (in my own opinion).  TI320c40 is fast,
  but it is not only fast, but flexible communication and reasonable
  cost.  This makes me to think of Alpha-PC, another joke, I think.

    							Porco.

    ps. this is only my own opinion, not representing anything else.

====================================================================
IC Yang 				 (u7811091@cc.nctu.edu.tw)
Room 216, Dorm. 12
EE dep of National Chiao-Tung University
Hsin-Chu, Taiwan, ROC.