Re: [Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMM

To:	Stefan Berger <stefanb@xxxxxxxxxx>
Subject:	Re: [Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:02:01.0
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Sat, 08 Sep 2007 09:57:40 +0100
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Sat, 08 Sep 2007 02:03:10 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<OF2F5AE878.78567D19-ON8525734F.0068388B-8525734F.006880D3@xxxxxxxxxx>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	Acfx9k9qjhlRbl3pEdyKtgAWy6hiGQ==
Thread-topic:	[Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:02:01.0
User-agent:	Microsoft-Entourage/11.3.6.070618

On 7/9/07 20:01, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

> You can change to e.g., a 128MB swiotlb by putting ‘swiotlb=128’ on
> you dom0 cmdline.

Not that I find this a good or intuitive solution, but at least now the error messages have disappeared. Couldn't this swiotlb grow automatically when needed?

No, it is allocated at boot time, and creating a larger one by default would waste memory on most systems.

-- Keir

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

xen-devel

Re: [Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMMU space