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Date:      05 Jul 2002 16:42:17 +0100
From:      Simon Dick <simond@irrelevant.org>
To:        Juha Ylitalo <juha.ylitalo@iki.fi>
Cc:        questions@FreeBSD.ORG
Subject:   Re: DMA on ATAPI (or lack of it ....)
Message-ID:  <1025883737.10728.4.camel@linux>
In-Reply-To: <1025883140.270.53.camel@shoes.st-paul>
References:  <1025883140.270.53.camel@shoes.st-paul>

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On Fri, 2002-07-05 at 16:32, Juha Ylitalo wrote:
> I am going to give you all the relevant stuff below. I ended up having
> so much of that stuff, that I decided to move my original question to
> the beginning and all system related stuff to the end.
> 
> My noname Athlon box seems to work nicely, except for those times, when
> I try to watch DVD movies (with ogle 0.8.4). Problem in movies is that
> framerate is 17-20 fps. 
> With quick check on system, problem turns out to be that DMA is turned
> on ATA, but not on ATAPI. Is there something (in BIOS, rearrange IDE
> devices, sysctl, kernel, ...) that I could do to change DMA on for atapi
> and that way I would get better performance from DVD drive or should I
> simply settle on what I get out of it at the moment (since movies really
> are only area, where it bothers me) and worry about it, when I buy my
> next machine, which will probably take at least 4-5 years (based on
> interval on my previous hardware upgrades).

Try adding this to /etc/sysctl.conf
hw.ata.atapi_dma=1

-- 
Simon Dick					simond@irrelevant.org


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