From: "Edgar E. Iglesias" <edgar.iglesias@axis.com>
To: qemu-devel@nongnu.org
Cc: Edgar Iglesias <edgar@axis.com>, Anthony Liguori <aliguori@us.ibm.com>
Subject: Re: [Qemu-devel] [PATCH][RFT] Make DMA timer driven
Date: Fri, 24 Oct 2008 00:04:54 +0200 [thread overview]
Message-ID: <20081023220453.GA15547@edgar.se.axis.com> (raw)
In-Reply-To: <1224797417-26044-1-git-send-email-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
next prev parent reply other threads:[~2008-10-23 22:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-23 21:30 [Qemu-devel] [PATCH][RFT] Make DMA timer driven Anthony Liguori
2008-10-23 22:04 ` Edgar E. Iglesias [this message]
2008-10-23 23:13 ` Paul Brook
2008-10-24 9:22 ` Edgar E. Iglesias
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