On Mon, Feb 22, 2016 at 02:56:27PM +0300, Vladimir Sementsov-Ogievskiy wrote: > Hi, Marc! > > Am I right, that this patch is necessary to reproduce your results from > "QEMU fw_cfg DMA interface"? > > >QEMU commit 2be4f242b50a8 and SeaBIOS commit 908a58c1d5ff > >QEMU startup time: .078 > >BIOS startup time: .060 > >Kernel setup time: .578 > >Total time: .716 > > > >QEMU with this patch series and SeaBIOS with this patch series > >QEMU startup time: .080 > >BIOS startup time: .039 > >Kernel setup time: .002 > >Total time: .121 > > Because, without this patch seabios (and independently of your other > patches) calls linuxboot optionrom, which loads kernel through io-ports > (It's in pc-bios/optionrom/linuxboot.S: > "read_fw_blob_addr32(FW_CFG_KERNEL)"), and this reading is the most > time-spending part of "Kernel setup" phase. > > Am I missing something?
Yes, this patch makes -kernel/-initrd use fw_cfg DMA. Stefan
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