Is there an known issue of access Xeon's RAM from PCIe (DMA access) ? We observe the issue when using linux 4.x on E5 servers ? We have this issue only with Xeon E5 + Linux, and using other Intel's chip there is no issue. When we use the same BIOS, Chip, with windows , we manage to access RAM's from PCIe (DMA access).
I've tried to search and asked the question, but got no response. Is it a known issue in this chip ? Why is it observed with Linux , but not with Windows ? Should I upgrade BIOS or is it some BIOS parameter that I should configure ?