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From: d87-mal@byse.nada.kth.se (Mats Löfkvist)
Newsgroups: comp.os.386bsd.questions
Subject: What performance is normal with bt445s scsi controller and fast disk?
Date: 15 Aug 94 00:22:24
Organization: Royal Institute of Technology, Stockholm, Sweden
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Distribution: comp
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I have a bt445s (rev. C, firmware 3.36) and a fast disk (Fujitsu 2694esa,
capable of at least 3MB/s sustained) in a 486dx2/66 vlb box. I'm running
FreeBSD 1.1.5.1. Everything works like a charm, but I'm a bit disappointed
with the performance I get: iozone results are around 600kB/s write, 800kB/s
read with the kernel configured for aha scsi. With a bt kernel I get worse
write performance and better read performance (~4-500kB/s and ~1MB/s).
The bt driver says my card is isa ("bt54x-ISA(24bit) bus" instead of the
expected "PCI/EISA/VLB(32bit) bus"), is this a hint to a configuration problem?
I have tried changing the undocumented switches on the card, switch 2-10 in
the not default position makes the bt driver add "eisa dma" (*) and makes the
aha kernel not work. Switch 2-9 doesn't seem to make a difference.
_
Mats Lofkvist
d87-mal@nada.kth.se
(*) In the 32-bit bt driver (bt742a_32.c) this message is changed to
"busmastering" which seems more right. Didn't make any noticeable
difference in iozone results though.