Date: Sat, 18 Apr 1998 18:35:34 -0700 (PDT) From: Donald Burr <dburr@POBoxes.com> To: Mark Mayo <mark@vmunix.com> Cc: hardware@FreeBSD.ORG, stable@FreeBSD.ORG Subject: RE: best wdc0 flags ? Message-ID: <XFMail.980418183534.dburr@POBoxes.com> In-Reply-To: <19980418023307.34709@vmunix.com>
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My secret spy satellite informs me that on 18-Apr-98, Mark Mayo wrote:
> 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
The best combination of flags is 0x80ff, this will turn on 32-bit
transfers and will do multi-block up to the maximum that is supported by
the drive.
> 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
My results are: (using flags 0x80ff80ff):
IOZONE performance measurements:
4828250 bytes/second for writing the file
5620741 bytes/second for reading the file
This is on a Maxtor 4.3 GB UDMA33 (84320D4).
- ---
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