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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] DL385 G2 - PCI-DMA: Random memory would be DMAed
On 18/10/07 20:05, "Zachary Richmond" <zak@xxxxxxxxxxx> wrote: > Regarding the full error message, all I am getting is: > > kernel panic not syncing: PCI-DMA: Random memory would be DMAed > > since the machine is rebooting after that. There maybe somewhere else to get > more detail, but beyond dmesg or messages I am not sure where else to look. You should also get a line immediately before that saying: "PCI-DMA: Out of SW-IOMMU space for xxx bytes at device xxx" This message makes it clear that your swiotlb is not big enough. The default size is 2MB if your machine has less than 2GB RAM. Otherwise the default is 64MB. You can increase the swiotlb size by, for example, adding 'swiotlb=128' as a boot parameter to your dom0 kernel (the example here would set the swiotlb size to be 128MB). Setting the parameter too small will make your system crash (as you have seen). Setting it bigger than necessary will waste memory. The optimum setting will depend on your system. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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