On Tue, Mar 09, 2010 at 09:03:41PM -0500, Kevin O'Connor wrote: > On Tue, Mar 09, 2010 at 02:11:20PM +0000, Richard W.M. Jones wrote: > > I noticed also with libguestfs that boot times have spiralled out of > > control again, and it seems to be down to the SeaBIOS change. SeaBIOS > > accounts for _9_ seconds of the boot sequence, up from very small > > (fraction of a second) for the old Bochs BIOS[1]. > > I'm surprised - a significant amount of effort has gone into making > SeaBIOS boot quickly. On my machine, the OS starts loading in well > under a second.
By a process of elimination, last night I worked out that the change is down to the following option ROMs: gPXE (not sure which exactly): 5 seconds pxe-virtio.bin: 4 seconds I can't find the source for the latter, but it seems neither is part of SeaBIOS, but are added from other sources by the Fedora build of qemu. I built a custom version of SeaBIOS [nicely documented code BTW, once I'd read the README file it was very simple to understand and customize!] which booted in under a second. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://et.redhat.com/~rjones/libguestfs/ See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html
