On Sun, Mar 20, 2016 at 05:28:05PM +0200, Török Edwin wrote: > On 03/20/2016 14:30, Richard W.M. Jones wrote: > > v1 was here: > > > > https://www.redhat.com/archives/libguestfs/2016-March/thread.html#00157 > > Thanks, this is much better than looking at 'ts -i' output. > > BTW I have use 'git am' to apply them to latest git HEAD and try it. > Is this the preferred way, or is there a git branch/repo somewhere that I > missed which would already have these applied?
I've just pushed what I'm working on to my fork of the repo (https://github.com/rwmjones/libguestfs/commits/master). > Ah, I didn't have sgabios installed, and it complained it couldn't > find an event (qemu:overhead?). Right - it's very sensitive to the exact debug output. > Installed it and I got similar results to yours, the largest > overhead is BIOS: > https://gist.github.com/anonymous/37cfb3d4eb3d3a1c86b2 Your qemu overhead is lower. That could be because of: https://bugzilla.redhat.com/show_bug.cgi?id=1319483 Interestingly your total time is at least double mine. Either your hardware is slower or there's something else going on. > Thought to try booting a Xen PV domain for comparison, but AFAICT > libguestfs doesn't support LIBGUESTFS_BACKEND=libvirt:xen:/// No, this isn't really going to work. It's a bunch of work to support completely different hypervisors like Xen, even with libvirt helping. > >, and the other ⅔rds is something else in SeaBIOS. > > Simply removing SGABIOS improves boot times to below 2s, but at a cost > > that we cannot see any messages from SeaBIOS so further measurement > > and therefore improvement becomes impossible. I'm going to try to fix > > SeaBIOS/SGABIOS first. See also: > > > > http://thread.gmane.org/gmane.comp.emulators.qemu/402196 SGABIOS turns out to be caused by something different from what I thought. See my attempt (not yet working) to fix this: https://github.com/rwmjones/libguestfs/commit/8ffab2d708e9480741b373c0702d12ed86dd572a I haven't looked at SeaBIOS yet. That's the biggest issue. > Nice, this would benefit booting regular VMs too, not just > libguestfs appliances, right? Yes, this work benefits everyone. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org _______________________________________________ Libguestfs mailing list [email protected] https://www.redhat.com/mailman/listinfo/libguestfs
