Date: Sat, 18 Apr 1998 02:33:07 -0400 From: Mark Mayo <mark@vmunix.com> To: stable@FreeBSD.ORG Cc: hardware@FreeBSD.ORG Subject: best wdc0 flags ? Message-ID: <19980418023307.34709@vmunix.com>
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Hi. I just put a shiney new IDE (Ultra33) drive in a machine, and
I'm wondering what the best flags to use for the drive are.. I realize
that I can't get DMA on -STABLE (cvsupping right now), but with the
default LINT flags of:
controller wdc0 at isa? port "IO_WD1" bio irq 14 flags 0x00ff8004 ..
which turns on 32-bit transfers and multi-block-4
I'm gettting really crappy performance..
vnode:{76}~ % iozone 160 32000
...
IOZONE performance measurements:
2237052 bytes/second for writing the file
2264181 bytes/second for reading the file
Now that is horrible. :-) Same results with block-size of 8K.
I think I'll try without the flag option at all and see how it performs.
Any recomendations appreciated,
-Mark
P.S. The drive is a Quantum Fireball SE 4.3GB, FWIW.
--
------------------------------------------------------------------------
Mark Mayo mark@vmunix.com
RingZero Comp. http://www.vmunix.com/mark
finger mark@vmunix.com for my PGP key and GCS code
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"The problem is how do you build tools that understand your programs
at a deeper semantic level." - James Gosling
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