#amiga 1200 & hard disks
03-Sep-93 00:48:15
Sb: #63459-#amiga 1200 & hard disks
Fm: Robert Comer 72446,656
To: R. Simonsen/MicroBotics 75300,3665
Well, I tried your maxtransfer settings, and I have something for you to
ponder… (I know Microbotics is not at fault, but any insight from
anyone is valuable, and I think I'm getting close to the answer!
I'll post my scsi speed and diskspeed at the end of this message, as it
might help confirm what I'm saying, and maybe someone will have the
answer!
When I set my maxtransfer to the suggested 65024, writes and creates in
Diskspeed jumped dramatically for me in all my partitions, (Though DH1: is
still the fastest for some reason.) However, reads, are still abysmal,
still only 180Ks. Could the IDE driver in the 1200 be requesting a bigger
read block than the above size, and could the seagate drive bump into s
slower mode when it get's a request like this? (I have none of the file
corruption problems as on the Maxtor's, so my drive handles bigger blocks,
just not so fast…)
It seems to me, when looking at the diskspeed numbers and comparing them
to older ones (reads and creates were a lot about 120Ks with the
maxtransfer higher,) that maxtransfer only covers transfers one way, ie.
writes to the drive.
If this is so, is there a way to limit the amount of the read request?
The SCSISPeed results are much better all the way around now, but I don't
the results to real world like when copying files.
MKSoft DiskSpeed 4.2 Copyright 1989-92 MKSoft Development
——————————————————-
—–
CPU: 68030 AmigaOS Version: 39.106 Normal Video DMA
Device: DH1: Buffers: 140
Comments: DiskSpeed 4.2 Started from Project Icon
CPU Speed Rating: 2722
Testing with a 262144 byte, MEMF_FAST, LONG-aligned buffer.
Create file: 196191 bytes/sec | CPU Available: 84%
Write to file: 421505 bytes/sec | CPU Available: 75%
Read from file: 189821 bytes/sec | CPU Available: 89%
Testing with a 262144 byte, MEMF_CHIP, LONG-aligned buffer.
Create file: 194878 bytes/sec | CPU Available: 74%
Write to file: 404735 bytes/sec | CPU Available: 55%
Read from file: 190650 bytes/sec | CPU Available: 84%
Average CPU Available: 77% | CPU Availability index: 2096
MKSoft ScsiSpeed 4.2 Copyright 1989-92 MKSoft Development
——————————————————-
—–
CPU: 68030 AmigaOS Version: 39.106 Normal Video DMA
Device: scsi.device:0
Comments: ScsiSpeed 4.2
CPU Speed Rating: 2718
Testing with a 512 byte, MEMF_FAST, LONG-aligned buffer.
Read from SCSI: 316006 bytes/sec | CPU Available: 26%
Testing with a 4096 byte, MEMF_FAST, LONG-aligned buffer.
Read from SCSI: 196470 bytes/sec | CPU Available: 86%
Testing with a 32768 byte, MEMF_FAST, LONG-aligned buffer.
Read from SCSI: 728359 bytes/sec | CPU Available: 65%
Testing with a 262144 byte, MEMF_FAST, LONG-aligned buffer.
Read from SCSI: 1025216 bytes/sec | CPU Available: 54%
Testing with a 512 byte, MEMF_CHIP, LONG-aligned buffer.
Read from SCSI: 292275 bytes/sec | CPU Available: 23%
Testing with a 4096 byte, MEMF_CHIP, LONG-aligned buffer.
Read from SCSI: 196645 bytes/sec | CPU Available: 82%
Testing with a 32768 byte, MEMF_CHIP, LONG-aligned buffer.
Read from SCSI: 720896 bytes/sec | CPU Available: 50%
Testing with a 262144 byte, MEMF_CHIP, LONG-aligned buffer.
Read from SCSI: 970903 bytes/sec | CPU Available: 35%
Average CPU Available: 53% | CPU Availability index: 1441
Bob Comer — Flying high and fast with my A1200HD'030 on Autopilot!
From Cheyenne, Wyoming U.S.A.