From: Bill Morrow (penzance_at_icanect.net)
Date: Fri Jun 25 1999 - 23:49:59 EDT
I must add my 2 c. worth here...
the P-II mobile modules have the BX chipset which caches all the memory that
can be added..
the older thinkpads without the P-II can't, but if it has not yet been
pointed out, more is better in memory, even uncached..
'cuz it lowers the swap file size.. and diminishes swap file hits..
makes things faster and more power efficient, overall..
just my two-bits worth.. :-)
STeve Andre' wrote:
> Well, you've pointed out the condition where adding memory it isn't
> needed will slow the system down. That makes sense, that your speech
> recognition program would run slower out of non-chaced memory.
>
> However, add 5 more programs to the mixture and you'd see the opposite
> results; any diminished swapping would be a large gain for you.
>
> But yes, you're right: for the condition of not swapping, adding memory
> in an unchached region of address space is no win. However, how many
> people encounter that? Certainly not the Windows world with ever
> decreasing program efficiency in each succeeding generation.
>
> --STeve Andre'
> andres_at_pilot.msu.edu
>
> At 09:45 AM 6/25/99 -0400, I Lee Hetherington wrote:
> >When I had a 233MHz Pentium MMX 770, I measured speed with 64MB and with
> >96MB. I measured the speed of our speech recognition system running in
> >Linux. This program fit comfortably inside of 64MB. With 96MB, the
> >system ran about 15% slower than with 64MB.
> >
> >Thus, if your OS tends to put your program above 64MB, and you do not
> >really need more than 64MB, you will see some slow down with the
> >"incredible design deficiency" of the common Intel chipsets that only
> >cache 64MB.
> >
> >Of course, YMMV, but more memory will not always be a win.
> >
> >I was happy to switch to a Pentium II ThinkPad 600 and have all 288MB
> >cached.
> >
> >--Lee
> >
> >
> >
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