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Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelera
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator |
Date: |
Wed, 5 Oct 2016 04:13:19 +0300 |
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
- [Qemu-devel] [PATCH 0/2] introduce "accel=best", Laurent Vivier, 2016/10/04
- [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Laurent Vivier, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Daniel P. Berrange, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Daniel P. Berrange, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/05
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/05
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/05
[Qemu-devel] [PATCH 2/2] tests: use accel=best instead of accel=kvm:tcg, Laurent Vivier, 2016/10/04
Re: [Qemu-devel] [PATCH 0/2] introduce "accel=best", Laurent Vivier, 2016/10/04
Re: [Qemu-devel] [PATCH 0/2] introduce "accel=best", Andrew Jones, 2016/10/04