Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!aplcen!haven!uvaarpa!ra!rwl
From: rwl@ra.cs.Virginia.EDU (Ray Lubinsky)
Newsgroups: comp.sys.ibm.pc
Subject: Re: (Disk) Cache problems...
Message-ID: <713@ra.cs.Virginia.EDU>
Date: 4 Dec 89 19:58:04 GMT
References: <638@ariadne.csi.forth.GR> <206900142@prism> <4276@pegasus.ATT.COM>
Organization: U.Va. CS Department, Charlottesville, VA
Lines: 29

In article <4276@pegasus.ATT.COM>, dmt@pegasus.ATT.COM (Dave Tutelman) writes:
: 
> I beg to [partially] differ.  I have run compiles on 3 machines:
>    1-	An old AT&T PC6300 (8086 @ 8MHz, 65 ms disk).
>    2-	An AT&T PC6300 PLUS (80286 @ 6 MHz, 65 ms disk).
>    3-	An AT&T 6386SX WGS (80386SX @ 16 MHz, ~30 ms disk).
> The PLUS has a 1MB disk cache in extended memory.
> The SX has room for a cache, but I haven't gotten around to adding it yet.
>
> The speed ratios are roughly 2 : 5 : 8  PLUS has cache, and
> 			     2 : 3 : 8  all without cache.
:
> That's a pretty dramatic improvement for the PLUS (60-70% speedup). 
> There's no way a 6MHz 286 with slow disk should run at more
> than half the speed of a 16 MHz 386SX with fast disk.

Even more impressive when you take into consideration that the 6300+ is NOT
an AT clone -- it has an 8-bit bus.  I don't know anything about the 6386SX,
but I would imagine it has a 16-bit bus.

| Ray Lubinsky                           rwl@uvacs.cs.virginia.edu (Internet) |
|                                        rwl@virginia                (BITnet) |
| Department of Computer Science,        ...!uunet!virginia!uvacs!rwl  (UUCP) |
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-- 
| Ray Lubinsky                           rwl@uvacs.cs.virginia.edu (Internet) |
|                                        rwl@virginia                (BITnet) |
| Department of Computer Science,        ...!uunet!virginia!uvacs!rwl  (UUCP) |
| University of Virginia                 (804) 982-2219               (voice) |