On Tue, Oct 04, 2016 at 07:16:49PM +0200, Paolo Bonzini wrote: > > > On 04/10/2016 16:18, Thomas Huth wrote: > >>> >> Using only tcg has also some disadvantages: For some tests, it's > >>> >> interesting to know whether they also work properly with KVM (e.g. > >>> >> migration tests), and only using tcg by default slows down the "make > >>> >> check" quite a bit - which might become an issue now that we're adding > >>> >> more and more tests. > >> > > >> > Which tests are you seeing a slow-down for ? > > Well, everything that is using accel=tcg in tests/ could be accelerated. > > For example, the new ipv6/ppc64 unit test is quite slow with TCG: > > > > sudo QTEST_QEMU_BINARY=ppc64-softmmu/qemu-system-ppc64 time tests/pxe-test > > > > 48.46user 0.07system 0:48.48elapsed > > Could that point to a firmware bug? 10 network-bound seconds for a boot > makes some sense, but 10 CPU-bound seconds don't... > > Paolo
AFAIK pxe firmware typically can't handle interrupts so it polls for packets. -- MST
