Date: Sat, 18 Apr 1998 10:09:36 +0200 (MEST) From: Søren Schmidt <sos@FreeBSD.ORG> To: mark@vmunix.com (Mark Mayo) Cc: stable@FreeBSD.ORG, hardware@FreeBSD.ORG Subject: Re: best wdc0 flags ? Message-ID: <199804180809.KAA08148@sos.freebsd.dk> In-Reply-To: <19980418023307.34709@vmunix.com> from Mark Mayo at "Apr 18, 98 02:33:07 am"
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In reply to Mark Mayo who 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
>
> 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.
Hmm, you should see about 9M/s from a drive like this..
I havn't run 2.2.x for ages but I've made two NFS servers with 4 of those
exact disks using -current, and it gets ~9M/s, so the facts are there...
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team
Even more code to hack -- will it ever end
..
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