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- From: "Frank Wille" <frank@phoenix.owl.de>
- Date: Thu, 15 Feb 1996 21:46:00 +0200
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- Subject: Re: Blizzard 1230IV how good ?
- Message-ID: <42116524@phoenix.owl.de>
- Organization: Phantasm
-
- Juergen "Rally" Fischer wrote on 12 Feb 1996 15:42:18 GMT
- about "Re: Blizzard 1230IV how good ?" :
-
-
- JF> |> >These are the measurements from my A4000/040:
- JF> |>
- JF> |> >---8<---
- JF> |> >Memory Speed Test
- JF> |> >⌐ Copyright Frank Wille, February 1996.
- JF> |>
- JF> |> >Type read write
- JF> |> >Chip Ram 4553 kB/s 4566 kB/s
- JF> |> >Fast Ram 11340 kB/s 6020 kB/s
- JF>
- JF> huh ? slower write in fastmem ? fastmem slower than a A1200 chipmem ?
-
- Yes. This is the sad truth. First, I couldn't believe it either. :(
- The slow writing into a 128k Fast buffer is caused by the 040's
- data cache copyback mode. When I disable data cache, I get 10.6
- MB/sec both for reading and writing.
-
-
- JF> |> From my A4000/030 :)
- JF> |> -------
- JF> |> ╗ Memory Speed Test ½
- JF> |> Copyright 1996 by Frank Wille.
- JF> |>
- JF> |> Type read write
- JF> |> Chip Ram 3742 kB/s 5747 kB/s
- JF> |> Fast Ram 11908 kB/s 15843 kB/s
- JF> |> -------
- JF> |>
- JF> |> This is in a 32col dblpal 720x520 screen (wb)
- JF> |>
- JF> |> I can get chip r/w 4349/6890 kB/s on a 2 colour screen :9
- JF> |> ^^^^
- JF> |> so thats approaching 7Mb/sec
- JF> |>
- JF> could you please also test (a0)+,(a1)+ which might give different
- JF> timings than (a0)+,dn & dn,(a1)+ ?
-
- I enhanced my little utility today, implementing copy- and ROM read
- tests. It will be on Aminet, replacing the old version, in the next
- days.
-
- Running it on my 4000/040 with Cybervision screen mode (i.e. *no*
- bitplane DMA at all), it looks like this:
-
- Type read write copy
- Chip RAM 4554 kB/s 4566 kB/s 2283 kB/s
- Fast RAM 11333 kB/s 6022 kB/s 4000 kB/s
- ROM 11300 kB/s - -
-
-
- -- _
- _ // Frank EMail: frank@phoenix.owl.de
- \X/ IRC: Phx @ #amiga(ger)
-
-