Xen fails to boot or hangs
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Quad-core system with less than 4 GB of memory
System is stable when not using Xen, but when booting with Xen, the system hangs during the boot process or when running I/O-intensive workloads.
This behaviour may also involve error messages similar to the following:
ERROR: PCI-DMA: Out of SW-IOMMU space for 16384 bytes at device 0000:06:01.0
ERROR: Kernel panic - not syncing: PCI-DMA: Memory would be corrupted
ERROR: Kernel panic - not syncing: PCI-DMA: Random memory would be DMAed
but can also occur without error messages.
The error messages listed above do not always show up on the system console and may require a serial console setup to be seen. Refer to TID 3456486: Configuring a Remote Serial Console for SLES for setup details.
Workaround for older kernels
Add the parameter
The swiotlb is a software implementation of a translation lookaside buffer (TLB) for input/output (I/O). Many systems implement I/O TLBs in hardware (sometimes known as "DMA address translation hardware"), but this hardware implementation is often not usable for virtualisation; refer to the Wikipedia article IOMMU for background.
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- Document ID:3692489
- Creation Date: 04-Jun-2007
- Modified Date:14-Mar-2021
- SUSE Linux Enterprise Server
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