> On Thu, 19 Dec 1996 09:53:33 -0500, Alex Fernandez
> >> >>Subject: RE: P6SNE bad Verite DMA performance?
> >> >>Hello Christopher,
> >> >> The Pentium Pro processor has extremely poor I/O performance. This is
> >> >>one of the reasons SCSI is always recommended. The memory functions
> >> >>are optimize at the sacrifice of the I/O sub-systems. There is not
> >> >>work about with this issue.
> >I'm having a hard time accepting this. I can't believe that Intel
> >Engineers
> >would be so stupid as to even cripple I/O performance in favor of memory
> >performance. Also, the above statement seems to me as a contradiction.
> >If
> >I/O performanace is so poor, why do they recommend a SCSI card? It
> >itself
> >is an I/O subsystem with some cards being able to do DMA transfers, ie.
> >bus
> >masters.
> >Is there another way to test DMA transfer speeds besides DMADIAG?
> >Alex
> SCSI devices require much less internention from the CPU. For
> instance some EIDE CD drives may consume as much as 50 % of your cpu's
> time. Not good. SCSI on the other hand uses much less. Can't remember
> the exact figures.
> I think the reference to SCSI has nothing to do with the Reactor
> card. He was just refering to what is suggested for general I/O
> performance if you buy a PRO.
> Vincent Aldridge
> Been playing games on PC's since 1980
> I be the DOOM GOD .... Bow to me....!!
[
RESPONSE.TXT 2K ]
> On Thu, 19 Dec 1996 09:53:33 -0500, Alex Fernandez
> >> >>Subject: RE: P6SNE bad Verite DMA performance?
> >> >>Hello Christopher,
> >> >> The Pentium Pro processor has extremely poor I/O performance. This is
> >> >>one of the reasons SCSI is always recommended. The memory functions
> >> >>are optimize at the sacrifice of the I/O sub-systems. There is not
> >> >>work about with this issue.
> >I'm having a hard time accepting this. I can't believe that Intel
> >Engineers
> >would be so stupid as to even cripple I/O performance in favor of memory
> >performance. Also, the above statement seems to me as a contradiction.
> >If
> >I/O performanace is so poor, why do they recommend a SCSI card? It
> >itself
> >is an I/O subsystem with some cards being able to do DMA transfers, ie.
> >bus
> >masters.
> >Is there another way to test DMA transfer speeds besides DMADIAG?
> >Alex
> SCSI devices require much less internention from the CPU. For
> instance some EIDE CD drives may consume as much as 50 % of your cpu's
> time. Not good. SCSI on the other hand uses much less. Can't remember
> the exact figures.
> I think the reference to SCSI has nothing to do with the Reactor
> card. He was just refering to what is suggested for general I/O
> performance if you buy a PRO.
> Vincent Aldridge
> Been playing games on PC's since 1980
> I be the DOOM GOD .... Bow to me....!!
My first forays with a HACK dungeon were in a VAX750 on a REGENT 200 but
I digress . . .
I am planning on a Dual Pentium Pro implementation for a desk top P6DNF.
Doesn't this allow one processor to deal with I/O while the other taunts
me at the monitor? This is of course is under NT.
SCSI peripherals are so much more costly than IDE. Is it worth the $s
and/or the hassle.
I digress again.
|I am Vwariff the knight of mirror . . .
|
|I bow to no one that doth bow to me. If Ye come seeking drink & droll
|belly up to the bar. If Ye come seeking war -- there be virtual war if
|and only if you ask for it. Ye need only make the dreaded system call
|vwariff().
AHH for an old fashioned 2 meg VAX with a dungeon full of gamers and an
Amulet of Yendor for the taking -- the Hell Hound hits!
Commercial systems aren't nearly the fun of good academic BSD source
code site. The above tag has been out of circ since '86. At that time I
was
Vwariff :-}
