On Sat, Jun 03, 2006 at 04:41:27PM +0100, Ian Campbell wrote: > On Sat, 2006-06-03 at 17:14 +0200, Sietse Visser wrote: > > I reported this before on the devel list, but there was no answer. > > You might have better luck on the xen-users list. > > > I am trying to use ivtv on a xen0 kernel. > > The module loads, everything works like tuning etc, except that video > > is stuttery - it is playing for about one second, stops half a second, > > and then plays again one second. > > On a non-Xen kernel, everything is fine. > > > > When loading the ivtv module, the following is reported > > in /var/log/messages (note the PCI-DMA messages): > > > Jun 3 16:59:01 marvin kernel: PCI-DMA: Out of SW-IOMMU space for 5460 > > bytes at device 0000:00:05.0 > > Xen dom0 always uses swiotlb and I think it defaults to a 2M region if > you have <2G RAM and 64M otherwise. There should be a message in dmesg > about it when it initialises. > > IVTV must use a lot of DMA memory since it appears to be running out. > You can increase the amount of space reserved with e.g. swiotlb=32M on > the dom0 kernel command line.
Is this the only way or could the ivtv module enlarge this on the fly during initialization? Probably not. :/ -- Axel.Thimm at ATrpms.net
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