From owner-freebsd-hackers@FreeBSD.ORG  Sat Oct 29 16:45:44 2005
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Date: Sat, 29 Oct 2005 18:45:27 +0200
From: Wilko Bulte <wb@freebie.xs4all.nl>
To: Mikhail Teterin <mi+mx@aldan.algebra.com>
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Cc: Peter Jeremy <PeterJeremy@optushome.com.au>, hackers@freebsd.org,
	hardware@freebsd.org, =?iso-8859-1?Q?S=F8ren?= Schmidt <sos@freebsd.org>
Subject: Re: Very slow writing to SATA disk
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On Fri, Oct 28, 2005 at 07:09:55PM -0400, Mikhail Teterin wrote..
> > Hmm, that does sound as problems with that disk, or maybe disk vs  
> > diskcontroller. Any chance you could try the disk on something else ?
> 
> I'll try...
> 
> > One other thing, how much mem do you have in there ? more than 4G and  
> > bounce buffering might get into the picture ruining the transfer rate...
> 
> 2Gb right now. Does the 4Gb limit apply to amd64 as well?

If your PCI card can only drive 32 addressbits you are toast beyond 4GB, 
in the sense that you need bounce buffers, regardless of the CPU.

-- 
Wilko Bulte				wilko@FreeBSD.org