On Sa, 2016-03-19 at 20:31 +0000, Richard W.M. Jones wrote: > I've been analyzing the libguestfs appliance[1] boot time. See > attached file, especially the end of it. > > About 50% of the boot time is because of SeaBIOS.
And the bulk of that is loading the kernel from fw_cfg. > I'm using the qemu -kernel option. I understand that the kernel needs > some BIOS features, eg. video stuff, E820. But kvmtool comes with a > really minimal BIOS that implements a tiny number of calls[2] and is > far faster than SeaBIOS. > > Is there something I'm missing, or for Linux + -kernel could we use a > much simpler BIOS? marc (cc'ed) worked on porting the linuxboot option rom over to use the new fwcfg dma interface, which should make things a order of magnitude faster. That seems to be stalled though. Marc? cheers, Gerd
