On 05/10/2016 03:13, Michael S. Tsirkin wrote: > 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... > > AFAIK pxe firmware typically can't handle interrupts > so it polls for packets.
Still wouldn't be appreciably slower when emulating. Paolo
