Chapter 3. Setting Up Virtual Machines / 3.6. Troubleshooting | ||||
|---|---|---|---|---|
 | 3.5. Deleting Virtual Machines | Chapter 4. Managing a Virtualization Environment |  | |
Chapter 3. Setting Up Virtual Machines / 3.6. Troubleshooting | ||||
|---|---|---|---|---|
| 3.5. Deleting Virtual Machines | Chapter 4. Managing a Virtualization Environment | | |
In some circumstances, problems may occur during the installation of the VM Guest. This section describes some known problems and their solutions.
The software I/O translation buffer allocates a large chunk of low memory early in the bootstrap process. If the requests for memory exceed the size of the buffer it usually results in a hung boot process. To check if this is the case, switch to console 10 and check the output there for a message similar to
kernel: PCI-DMA: Out of SW-IOMMU space for 32768 bytes at device 000:01:02.0
In this case you need to increase the size of the swiotlb. Add
“swiotlb=128” on the Domain0 cmdline. Note that the
number can be adjusted up or down to find the optimal size for
the machine.
