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[Xen-users] Does the amount of main memory influence PCI pass through (DMA) capability?

  • To: Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Stephan AustermÃhle <au@xxxxxxx>
  • Date: Sat, 27 Jun 2009 21:48:28 +0200
  • Delivery-date: Sat, 27 Jun 2009 12:49:22 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi there,

after solving a lot of problems with my DVB-S card it finally ran fine in my 
domU (3.3.2-rc2, 64 bit, Debian Lenny kernel 2.6.26-2, 64 bit). However, my 
memory upgrade kit arrived so I upgraded main memory from 16 gbytes to 32 
gbytes. Since then I have a lot of strange issues which are all looking like no 
data is transfered from the DVB-S card to the domU. When running the tool 
"dvbtraffic" I get the following message on the console:

        cx8802_start_dma() Failed. Unsupported value in .mpeg (0x00000001)

Does the amount of main memory influence the capability to use DMA transfers?

I don't see any other error message (xm dmesg, xm log, dom0 logs, domU logs). 
Do I have a chance to get more debug information on this?

Kind regards,


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