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- Path: sparky!uunet!usc!sdd.hp.com!caen!kuhub.cc.ukans.edu!parsifal.umkc.edu!vax1.umkc.edu!eputnam
- Newsgroups: comp.os.ms-windows.setup
- Subject: Re: ..SMARTDRV vs Built-in Cache, built-in is faster!....
- Message-ID: <1992Aug22.171940.1@vax1.umkc.edu>
- From: eputnam@vax1.umkc.edu
- Date: Sat, 22 Aug 1992 23:19:40 GMT
- Sender: root@parsifal.umkc.edu (Parsifal Administration)
- References: <0095F799.22B17580@vms.csd.mu.edu>
- Organization: University of Missouri - Kansas City
- Lines: 42
-
- In article <0095F799.22B17580@vms.csd.mu.edu>, 5916rahmank@vms.csd.mu.edu writes:
- >
- > Hi Folks:
- > Finally I got 4M ram on my DTC SCSI card and I ran the
- > smartdrv vs. buitl-in cache experiment again. And yes,
- > built-in cache is faster than the smartdrv cache!
- >
- > (a) Here is one comparison. It took 29:00 sec to load the NDW
- > along with lots of icons (win 3.1) when I tested with
- > 512K built-in + 1mb smartdrv cache (as I reported before).
- >
- > (b) With 4mb cache on the card it takes only 12:12 sec! (no smartdrv).
- >
- > (c) According to previous discussions in this thread, built-in
- > + smartdrv should be slower than the built-in cache alone.
- > This is precisely what I found, it took 22:00 sec to load
- > NDW and everything with the 4mb built-in + 2mb smartdrv!
- >
- > So now, there is no contradiction between theory and experiment!
- >
- > These tests were done on a stacked drive, so results may be
- > different on an unstacked drive.
- >
- > - Anis, Dept. of EECE, Marquette University.
-
- My only questions are: 1)How much RAM do you have and 2)Is your machine
- ISA/EISA/MC? The reason I ask about memory is that if you are converting
- a large portion of your RAM to cache then you could see a lower performance
- due to swapping to the drive during the startup. If your machine is an ISA,
- then a memory cache should be faster than a hardware cache just because it
- doesn't have to transmit through the bus (major slowdown on ISA).
-
- Personally, I have a Promise Tech controller card with 8 Meg of RAM controlling
- a Maxtor 7120A IDE drive and a 1 Meg PC-Cache drive cache. I timed how long
- it takes to start Windows 3.1 and found no difference between no software
- cache and software cache. I do however notice the difference when I am
- working with moderate sized files and find the software cache very nice to
- have. Of course, this doesn't apply to OS/2 where more free memory is better
- than more cache, but that is another story.
-
- Almost forgot... My machine is an ISA 386DX-25 with 8 Meg of RAM.
-
-