Sujet : Re: Instruction Tracing
De : johnl (at) *nospam* taugh.com (John Levine)
Groupes : comp.archDate : 11. Aug 2024, 02:57:10
Autres entêtes
Organisation : Taughannock Networks
Message-ID : <v995pm$1cni$2@gal.iecc.com>
References : 1 2
User-Agent : trn 4.0-test77 (Sep 1, 2010)
It appears that Lawrence D'Oliveiro <
ldo@nz.invalid> said:
(ROMP was also one of those RISC architectures that had delayed branches,
along with MIPS, HP-PA and I think SPARC as well.)
>
I have heard it said that the RT PC was a poor advertisement for the
benefits of RISC, and the joke was made that “RT” stood for “Reduced
Technology”.
I worked on AIX for the RT/PC. It was a pretty reasonable chip for the
time, but it suffered greatly from internal IBM political fights which
made it too little too late. AIX ran on top of a bloated virtual
machine which made the whole thing too slow. There was skunkworks port
of BSD that was supposed to be a lot better.
As far as the delayed branches and such, they made sense in the narrow
time window when it was too expensive to put a cache on a workstation
but that time came and went by the time the RT shipped.
-- Regards,John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",Please consider the environment before reading this e-mail. https://jl.ly