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Date: Fri, 24 Oct 2008 00:04:54 +0200
From: "Edgar E. Iglesias" <edgar.iglesias@axis.com>
Subject: Re: [Qemu-devel] [PATCH][RFT] Make DMA timer driven
Message-ID: <20081023220453.GA15547@edgar.se.axis.com>
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To: qemu-devel@nongnu.org
Cc: Edgar Iglesias <edgar@axis.com>, Anthony Liguori <aliguori@us.ibm.com>

On Thu, Oct 23, 2008 at 04:30:17PM -0500, Anthony Liguori wrote:
> The current DMA routines are driven by a call in main_loop_wait() after every
> select.  The effect of this is that the DMA runs at a 10ms frequency depending
> on whether IO is pending.
> 
> This patch converts the DMA code from using this implicit 10ms frequency to
> having an explicit 10ms frequency using a QEMUTimer.  This means boards no
> longer have to stub out DMA_run() functions.
> 
> The only two architectures implementing DMA_run() are cris and i386.  For cris,
> I converted it to a simple repeating timer.  I've only compile tested this so
> I'd appreciate if you could test it Edgar (or point me to an image).

Hello Anthony,

You can find info regarding CRIS/ETRAX testing here:
http://lists.gnu.org/archive/html/qemu-devel/2008-09/msg00279.html

I tested the patch. It works but unfortunately DMA transfers to/from
the ethernet block now seem to emulate very slowly.

Best regards