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From: Kees Jan Koster <dutchman@spase.nl>
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Subject: dd result.
To: freebsd-hackers@FreeBSD.ORG (FreeBSD hackers Mailing list)
Date: Wed, 10 Apr 1996 13:27:18 +0200 (MET DST)
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> How comes the 486 needs twice as much time
> as a P90 to complete just about any task ? ;-) 
> 
> Honestly: I'm not sure what you are doing 
> in these tests, since the numbers are low 
> for the NCR SCSI as well as the IDE case.
> 
> I'd guess that both the Seagate and the
> Maxtor are old drives (or they'd read more
> than 2MB/s in the "Block Input" test).
> 
> 
> How about a different test:
> 
> # time dd if=/dev/rsd0c of=/dev/null bs=64k count=1000
> 1000+0 records in
> 1000+0 records out
> 65536000 bytes transferred in 9 secs (7281777 bytes/sec)
>         9.32 real         0.02 user         0.24 sys
> 
> (ASUS SP3G with NCR and Quantum Atlas 2GB.)
> 
> What are your numbers for both the NCR and
> the EIDE system ?
> 

# time dd if=/dev/rwd0s1 of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes transferred in 26 secs (2520615 bytes/sec)
       26.20 real         0.04 user         0.29 sys

Seems to me there's something left to be configured.
the system is (the IDE controller is on-board):
CPU: 90-MHz Pentium 735\\90 (Pentium-class CPU)
  Origin = "GenuineIntel"  Id = 0x525  Stepping=5
  Features=0x1bf<FPU,VME,PSE,MCE,CX8,APIC>
wdc0 at 0x1f0-0x1f7 irq 14 on isa
wdc0: unit 0 (wd0): <QUANTUM TRB850A>
wd0: 810MB (1660176 sectors), 1647 cyls, 16 heads, 63 S/T, 512 B/S