On Thu, 14 Feb 2013 13:13:18 +0100 Paolo Bonzini <pbonz...@redhat.com> wrote:
> Il 14/02/2013 12:18, Eduardo Habkost ha scritto: > >> > qemu boots from disk image 3 times faster than direct kernel load. > > That's surprising. Do you have any idea why that happens? > > Because kernel load uses MMIO (from fw_cfg), while booting from disk > uses at worst PCI DMA and at best virtio. > > Paolo I've tried Paolo's suggestion to run in TCG mode with instruction logging, and it spends too much time reading 11K kernel from qemu compared to kvm-unit-test kernel. I'll need debug it further to find out why. But this patch looks unnecessary if I could fix qemu/seabios or test kernel to reach the same load time as kvm-unit-test kernel. -- Regards, Igor
