Hi, On 04/03/2024 07:32, Jan Beulich wrote: > BARs of size 2Gb and up can't possibly fit below 4Gb: Both the bottom of > the lower 2Gb range and the top of the higher 2Gb range have special > purpose. Don't even have them influence whether to (perhaps) relocate > low RAM. > > Reported-by: Neowutran <x...@neowutran.ovh> > Signed-off-by: Jan Beulich <jbeul...@suse.com> > --- > If we wanted to fit e.g. multiple 1Gb BARs, it would likely be prudent > to similarly avoid low RAM relocation in the first place. Yet accounting > for things differently depending on how many large BARs there are would > require more intrusive code changes.> > That said, I'm open to further lowering of the threshold. That'll > require different justification then, though. > GPUs without resizable BARs tend to expose 256MiB on the BAR regardless of the amount of internal VRAM, AFAIK. So IMO 256 MiB is not a totally unmotivated number. I don't know which other PCIe devices might expose such big BARs for comparison.
Cheers, Alejandro
