Hi Philippe, On Wed, Dec 5, 2018 at 1:26 PM Philippe Mathieu-Daudé <phi...@redhat.com> wrote: > > Hi Stefano, > > On 3/12/18 17:35, Stefano Garzarella wrote: > > On Mon, Dec 3, 2018 at 4:44 PM Rob Bradford <robert.bradf...@intel.com> > > wrote: > >> > >> Hi Stefano, thanks for capturing all these numbers, > >> > >> On Mon, 2018-12-03 at 15:27 +0100, Stefano Garzarella wrote: > >>> Hi Rob, > >>> I continued to investigate the boot time, and as you suggested I > >>> looked also at qemu-lite 2.11.2 > >>> (https://github.com/kata-containers/qemu) and NEMU "virt" machine. I > >>> did the following tests using the Kata kernel configuration > >>> ( > >>> https://github.com/kata-containers/packaging/blob/master/kernel/configs/x86_64_kata_kvm_4.14.x > >>> ) > >>> > >>> To compare the results with qemu-lite direct kernel load, I added > >>> another tracepoint: > >>> - linux_start_kernel: first entry of the Linux kernel > >>> (start_kernel()) > >>> > >> > >> Great, do you have a set of patches available that all these trace > >> points. It would be great for reproduction. > > > > For sure! I'm attaching a set of patches for qboot, seabios, ovmf, > > nemu/qemu/qemu-lite and linux 4.14 whit the tracepoints. > > I'm also sharing a python script that I'm using with perf to extract > > the numbers in this way: > > > > $ perf record -a -e kvm:kvm_entry -e kvm:kvm_pio -e > > sched:sched_process_exec -o /tmp/qemu_perf.data & > > $ # start qemu/nemu multiple times > > $ killall perf > > $ perf script -s qemu-perf-script.py -i /tmp/qemu_perf.data > [...] > Good stuff. At some point I'd like to have such scripts in the QEMU > repository to run perf tests on a regular basis (eventually keep those > metrics somewhere) to be able to catch when we add code that add > timeoutes and increase boot time.
Thanks for your feedback, maybe we need a version of SeaBIOS and Linux kernel compiled with the probes. I'll keep you update. Cheers, Stefano > > Regards, > > Phil. -- Stefano Garzarella Red Hat
