Talk:POWER9 Hardware Compatibility List/PCIe Devices
Revision as of 10:21, 2 February 2020 by FlyingBlackbird (talk | contribs) (Fixed 40 bits are 1 TB (not 128 GB))
What is the impact of incomplete PCIe address space (eg. 40 instead of 64 bits)?
This page says:
> Incomplete memory addressing support. The PCIe architecture specifies a 64-bit address space. > Some I/O devices try to economize on this by only implementing e.g. 40 bits for their addressing, > rendering them incapable of addressing host memory which lies above address 240. (Firmware patches to work around this are pending.)
2^40 means 1 TB of RAM. Does this mean I can still use this these PCIe devices without any unwanted side-effects if I do not have more than 128 GB RAM?
