On Mon, Sep 21, 2015 at 03:14:04PM +0200, Marc Marí wrote:
Implement support for booting from a PMEM region compatible with NVDIMM and NFIT specifications.
The current implementation is still slow. When running a Linux guest on top of QEMU in x86:
Using actual -kernel option: QEMU startup time: .080 BIOS startup time: .060 Kernel setup time: .590 Total time: .730
Using -kernel option and fw_cfg DMA patch: QEMU startup time: .080 BIOS startup time: .039 Kernel setup time: .002 Total time: .121
Using this patch series and adding the vmlinuz as a NVDIMM device: QEMU startup time: .080 BIOS startup time: .065 Kernel setup time: .015 Total time: .160
Thanks Marc - very interesting!
Do you think NVDIMM support will ultimately be faster than DMA or are there other advantages to using NVDIMMs?
-Kevin