On Fri, Aug 07, 2026 at 06:13:49PM +0000, Mostafa Saleh wrote: > But the whole thing is best effort anyway, the kernel picks > IO_TLB_DEFAULT_SIZE which does not depend on the system topology or > how many devices or how much DMA they do. > SWIOTLB memory is wasted if unused so we should be careful around > that as it would be the other way around and users would have to > decrease it manually.
Yeah, it is why the arch code shouldn't really be sizing it directly, it should be done in common code and, yes, we are probably going to have to do something alot smarter to have the common code better auto-tune this for the CC case.. Jason
