Also, I do believe that write combining is enabled based on: $ lspci -v -s 00:06.0 00:06.0 Ethernet controller: Amazon.com, Inc. Elastic Network Adapter (ENA) Physical Slot: 6 Flags: bus master, fast devsel, latency 0 Memory at febf8000 (32-bit, non-prefetchable) [size=16K] Memory at fe900000 (32-bit, prefetchable) [size=1M] Memory at febe0000 (32-bit, non-prefetchable) [size=64K] Capabilities: [70] Express Endpoint, MSI 00 Capabilities: [b0] MSI-X: Enable+ Count=9 Masked- Kernel driver in use: vfio-pci Kernel modules: ena
root@ip-10-21-120-175:~# cat /sys/kernel/debug/x86/pat_memtype_list | grep fe900000 PAT: [mem 0x00000000fe800000-0x00000000fe900000] write-combining PAT: [mem 0x00000000fe900000-0x00000000fea00000] uncached-minus PAT: [mem 0x00000000fe900000-0x00000000fea00000] uncached-minus
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