linux-kernel - Re: Conflict between ide and usb?

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Date:	Fri, 16 Mar 2007 17:12:53 -0300
From:	John Coppens <john@...ppens.com>
To:	"Lee Revell" <rlrevell@...-job.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Conflict between ide and usb?

On Fri, 16 Mar 2007 15:52:12 -0400
"Lee Revell" <rlrevell@...-job.com> wrote:

> On 3/16/07, John Coppens <john@...ppens.com> wrote:
> > The problem I have, is that when I copy a file from a DVD to harddisk,
> > the internet connection almost dies (it slows down terribly, so much
> > so that established connections actually disconnect, ping looses
> > packets, DNS lookup fails, etc). After copy ends, all returns to
> > normal.
> 
> Sounds like DMA starvation, it's been seen in the past with some SATA
> controllers.  Presumably vendors do it to improve benchmark scores.

Hi Lee.

In this case SATA isn't used, as the copy is from IDE to IDE. But I
doubt bandwidth has anything to do with it. The DVD transfer rate rarely 
reaches 3.3 MB/s - which by itself isn't normal.

> You can confirm it by forcing the hard drive and/or DVD drive to a
> lower speed if your BIOS allows it.

No... I didn't find any way to lower the speed.

Thanks
John
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