From owner-freebsd-hardware  Sat Oct 17 09:30:19 1998
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	Sun, 18 Oct 1998 02:29:44 +1000
Date: Sun, 18 Oct 1998 02:29:44 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199810171629.CAA32472@godzilla.zeta.org.au>
To: hardware@FreeBSD.ORG, questions@FreeBSD.ORG, roger@cs.strath.ac.uk
Subject: Re: Realtek 8029 goes slow. 200k/second.
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>In my kernerl config settings I changed the IDE controller to enable
>32bit transfers
>with maximum sector transfers
>
>So, I changed
>  controller  wdc0  at isa? port "IO_WD1" bio irq 14 vector wdintr
>
>to this
>  controller  wdc0  at isa? port "IO_WD1" bio irq 14 flags 0x80ff80ff
>vector wdintr
>
>
>And now I can FTP files from our server at 1000k/second.

Try using DMA mode (flags 0x20002000).  The best case for PIO mode
(16MB/sec) can barely keep up with a current fast IDE disk (14MB/sec?),
and since the CPU is doing the tranfer, this matters more than when
a busmastering SCSI controller can't keep up.

With 16-bit transfers, the best case for PIO mode is 8MB/sec, so it
couldn't even keep up with yesterday's fast IDE disk (10MB/sec).

Bruce

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