Xen 4.2 Limits: Difference between revisions
From Xen
Jump to navigationJump to search
Lars.kurth (talk | contribs) (Created page with "{{TODO|This is a work in progress. Feel free to add requests for more to the talk page or add additional information here}} This document contains information about limits of Xe…") |
Lars.kurth (talk | contribs) m (→Other Limits) |
||
| Line 11: | Line 11: | ||
* Maximum of 32K interrupts and 2k PCI segments: this limits the number of devices that can be |
* Maximum of 32K interrupts and 2k PCI segments: this limits the number of devices that can be |
||
used in two ways. |
used in two ways. |
||
* The number of devices many can be attached to the system must fit into 2k PCI segments, i.e. 2k * 256 [buses] * 32 [devices] * 8 [functions]) |
** The number of devices many can be attached to the system must fit into 2k PCI segments, i.e. 2k * 256 [buses] * 32 [devices] * 8 [functions]) |
||
** The number of hardware interrupts they may surface (one would expect at least one interrupt per device function, so this is the stricter of the two limitations). |
** The number of hardware interrupts they may surface (one would expect at least one interrupt per device function, so this is the stricter of the two limitations). |
||
Revision as of 16:52, 13 August 2012
|
To Do:
This is a work in progress. Feel free to add requests for more to the talk page or add additional information here |
This document contains information about limits of Xen 4.2.
CPUs & Memory
- Xen can scale up to 4,095 host CPUs with 5Tb of RAM.
- Using Para Virtualization (PV), Xen supports a maximum of 512 VCPUs with 512Gb RAM per guest.
- Using Hardware Virtualization (HVM), Xen supports a maximum of 128 VCPUs with 512Gb RAM per guest.
Other Limits
- Maximum of 32K interrupts and 2k PCI segments: this limits the number of devices that can be
used in two ways.
- The number of devices many can be attached to the system must fit into 2k PCI segments, i.e. 2k * 256 [buses] * 32 [devices] * 8 [functions])
- The number of hardware interrupts they may surface (one would expect at least one interrupt per device function, so this is the stricter of the two limitations).
